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Finding the Fourth Proportional to 138,487.55, 207,657.50 and 71,860.59

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Solution

The fourth proportional to 138,487.55, 207,657.50 and 71,860.59 is: 107,752.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,487.55 : 207,657.50 = 71,860.59 : x
  2. Step 2: Convert to fraction form
    138,487.55/207,657.50 = 71,860.59/x
  3. Step 3: Cross multiply
    138,487.55x = 207,657.50 × 71,860.59
  4. Step 4: Simplify right side
    138,487.55x = 14,922,390,108.62
  5. Step 5: Solve for x
    x = 14,922,390,108.62/138,487.55
  6. Step 6: Final answer
    x = 107,752.58

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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.