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Finding the Fourth Proportional to 68,708.72, 103,531.10 and 56,502.15

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Solution

The fourth proportional to 68,708.72, 103,531.10 and 56,502.15 is: 85,138.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,708.72 : 103,531.10 = 56,502.15 : x
  2. Step 2: Convert to fraction form
    68,708.72/103,531.10 = 56,502.15/x
  3. Step 3: Cross multiply
    68,708.72x = 103,531.10 × 56,502.15
  4. Step 4: Simplify right side
    68,708.72x = 5,849,729,459.35
  5. Step 5: Solve for x
    x = 5,849,729,459.35/68,708.72
  6. Step 6: Final answer
    x = 85,138.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.