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Finding the Fourth Proportional to 138,430.80, 207,646.20 and 91,191.60

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Solution

The fourth proportional to 138,430.80, 207,646.20 and 91,191.60 is: 136,787.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,430.80 : 207,646.20 = 91,191.60 : x
  2. Step 2: Convert to fraction form
    138,430.80/207,646.20 = 91,191.60/x
  3. Step 3: Cross multiply
    138,430.80x = 207,646.20 × 91,191.60
  4. Step 4: Simplify right side
    138,430.80x = 18,935,589,211.92
  5. Step 5: Solve for x
    x = 18,935,589,211.92/138,430.80
  6. Step 6: Final answer
    x = 136,787.40

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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.