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Finding the Fourth Proportional to 490,436.76, 676,781.14 and 286,506.56

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Solution

The fourth proportional to 490,436.76, 676,781.14 and 286,506.56 is: 395,366.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,436.76 : 676,781.14 = 286,506.56 : x
  2. Step 2: Convert to fraction form
    490,436.76/676,781.14 = 286,506.56/x
  3. Step 3: Cross multiply
    490,436.76x = 676,781.14 × 286,506.56
  4. Step 4: Simplify right side
    490,436.76x = 193,902,236,294.28
  5. Step 5: Solve for x
    x = 193,902,236,294.28/490,436.76
  6. Step 6: Final answer
    x = 395,366.44

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.