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Finding the Fourth Proportional to 318,068.90, 477,103.04 and 81,411.20

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Solution

The fourth proportional to 318,068.90, 477,103.04 and 81,411.20 is: 122,116.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,068.90 : 477,103.04 = 81,411.20 : x
  2. Step 2: Convert to fraction form
    318,068.90/477,103.04 = 81,411.20/x
  3. Step 3: Cross multiply
    318,068.90x = 477,103.04 × 81,411.20
  4. Step 4: Simplify right side
    318,068.90x = 38,841,531,010.05
  5. Step 5: Solve for x
    x = 38,841,531,010.05/318,068.90
  6. Step 6: Final answer
    x = 122,116.72

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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.