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Finding the Fourth Proportional to 138,367.80, 207,551.70 and 91,128.60

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Solution

The fourth proportional to 138,367.80, 207,551.70 and 91,128.60 is: 136,692.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,367.80 : 207,551.70 = 91,128.60 : x
  2. Step 2: Convert to fraction form
    138,367.80/207,551.70 = 91,128.60/x
  3. Step 3: Cross multiply
    138,367.80x = 207,551.70 × 91,128.60
  4. Step 4: Simplify right side
    138,367.80x = 18,913,895,848.62
  5. Step 5: Solve for x
    x = 18,913,895,848.62/138,367.80
  6. Step 6: Final answer
    x = 136,692.90

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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.