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Finding the Fourth Proportional to 138,965.60, 208,545.60 and 89,166.80

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Solution

The fourth proportional to 138,965.60, 208,545.60 and 89,166.80 is: 133,812.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,965.60 : 208,545.60 = 89,166.80 : x
  2. Step 2: Convert to fraction form
    138,965.60/208,545.60 = 89,166.80/x
  3. Step 3: Cross multiply
    138,965.60x = 208,545.60 × 89,166.80
  4. Step 4: Simplify right side
    138,965.60x = 18,595,343,806.08
  5. Step 5: Solve for x
    x = 18,595,343,806.08/138,965.60
  6. Step 6: Final answer
    x = 133,812.57

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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.