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Finding the Fourth Proportional to 839.49, 1,258.75 and 345.76

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Solution

The fourth proportional to 839.49, 1,258.75 and 345.76 is: 518.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.49 : 1,258.75 = 345.76 : x
  2. Step 2: Convert to fraction form
    839.49/1,258.75 = 345.76/x
  3. Step 3: Cross multiply
    839.49x = 1,258.75 × 345.76
  4. Step 4: Simplify right side
    839.49x = 435,225.40
  5. Step 5: Solve for x
    x = 435,225.40/839.49
  6. Step 6: Final answer
    x = 518.44

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.