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Finding the Fourth Proportional to 559,428.80, 839,143.20 and 259,809.80

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Solution

The fourth proportional to 559,428.80, 839,143.20 and 259,809.80 is: 389,714.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    559,428.80 : 839,143.20 = 259,809.80 : x
  2. Step 2: Convert to fraction form
    559,428.80/839,143.20 = 259,809.80/x
  3. Step 3: Cross multiply
    559,428.80x = 839,143.20 × 259,809.80
  4. Step 4: Simplify right side
    559,428.80x = 218,017,626,963.36
  5. Step 5: Solve for x
    x = 218,017,626,963.36/559,428.80
  6. Step 6: Final answer
    x = 389,714.70

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.