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Finding the Fourth Proportional to 138,543.60, 207,815.40 and 45,058.80

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Solution

The fourth proportional to 138,543.60, 207,815.40 and 45,058.80 is: 67,588.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,543.60 : 207,815.40 = 45,058.80 : x
  2. Step 2: Convert to fraction form
    138,543.60/207,815.40 = 45,058.80/x
  3. Step 3: Cross multiply
    138,543.60x = 207,815.40 × 45,058.80
  4. Step 4: Simplify right side
    138,543.60x = 9,363,912,545.52
  5. Step 5: Solve for x
    x = 9,363,912,545.52/138,543.60
  6. Step 6: Final answer
    x = 67,588.20

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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.