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Finding the Fourth Proportional to 72,512.80, 108,769.20 and 25,770.40

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Solution

The fourth proportional to 72,512.80, 108,769.20 and 25,770.40 is: 38,655.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,512.80 : 108,769.20 = 25,770.40 : x
  2. Step 2: Convert to fraction form
    72,512.80/108,769.20 = 25,770.40/x
  3. Step 3: Cross multiply
    72,512.80x = 108,769.20 × 25,770.40
  4. Step 4: Simplify right side
    72,512.80x = 2,803,025,791.68
  5. Step 5: Solve for x
    x = 2,803,025,791.68/72,512.80
  6. Step 6: Final answer
    x = 38,655.60

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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.