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Finding the Fourth Proportional to 438,115.20, 655,714.80 and 317,830.20

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Solution

The fourth proportional to 438,115.20, 655,714.80 and 317,830.20 is: 475,687.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,115.20 : 655,714.80 = 317,830.20 : x
  2. Step 2: Convert to fraction form
    438,115.20/655,714.80 = 317,830.20/x
  3. Step 3: Cross multiply
    438,115.20x = 655,714.80 × 317,830.20
  4. Step 4: Simplify right side
    438,115.20x = 208,405,966,026.96
  5. Step 5: Solve for x
    x = 208,405,966,026.96/438,115.20
  6. Step 6: Final answer
    x = 475,687.60

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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.