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Finding the Fourth Proportional to 138,793.60, 208,141.80 and 72,211.60

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Solution

The fourth proportional to 138,793.60, 208,141.80 and 72,211.60 is: 108,292.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,793.60 : 208,141.80 = 72,211.60 : x
  2. Step 2: Convert to fraction form
    138,793.60/208,141.80 = 72,211.60/x
  3. Step 3: Cross multiply
    138,793.60x = 208,141.80 × 72,211.60
  4. Step 4: Simplify right side
    138,793.60x = 15,030,252,404.88
  5. Step 5: Solve for x
    x = 15,030,252,404.88/138,793.60
  6. Step 6: Final answer
    x = 108,292.11

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1.5x scale

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.