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Finding the Fourth Proportional to 865,714.80, 1,298,572.20 and 487,801.20

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Solution

The fourth proportional to 865,714.80, 1,298,572.20 and 487,801.20 is: 731,701.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,714.80 : 1,298,572.20 = 487,801.20 : x
  2. Step 2: Convert to fraction form
    865,714.80/1,298,572.20 = 487,801.20/x
  3. Step 3: Cross multiply
    865,714.80x = 1,298,572.20 × 487,801.20
  4. Step 4: Simplify right side
    865,714.80x = 633,445,077,446.64
  5. Step 5: Solve for x
    x = 633,445,077,446.64/865,714.80
  6. Step 6: Final answer
    x = 731,701.80

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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.