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Finding the Fourth Proportional to 103,810.10, 155,387.10 and 81,502.70

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Solution

The fourth proportional to 103,810.10, 155,387.10 and 81,502.70 is: 121,996.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,810.10 : 155,387.10 = 81,502.70 : x
  2. Step 2: Convert to fraction form
    103,810.10/155,387.10 = 81,502.70/x
  3. Step 3: Cross multiply
    103,810.10x = 155,387.10 × 81,502.70
  4. Step 4: Simplify right side
    103,810.10x = 12,664,468,195.17
  5. Step 5: Solve for x
    x = 12,664,468,195.17/103,810.10
  6. Step 6: Final answer
    x = 121,996.49

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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.