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Finding the Fourth Proportional to 72,221.20, 108,331.80 and 71,760.40

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Solution

The fourth proportional to 72,221.20, 108,331.80 and 71,760.40 is: 107,640.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,221.20 : 108,331.80 = 71,760.40 : x
  2. Step 2: Convert to fraction form
    72,221.20/108,331.80 = 71,760.40/x
  3. Step 3: Cross multiply
    72,221.20x = 108,331.80 × 71,760.40
  4. Step 4: Simplify right side
    72,221.20x = 7,773,933,300.72
  5. Step 5: Solve for x
    x = 7,773,933,300.72/72,221.20
  6. Step 6: Final answer
    x = 107,640.60

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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.