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Finding the Fourth Proportional to 72,385.70, 108,542.10 and 42,812.60

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Solution

The fourth proportional to 72,385.70, 108,542.10 and 42,812.60 is: 64,197.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,385.70 : 108,542.10 = 42,812.60 : x
  2. Step 2: Convert to fraction form
    72,385.70/108,542.10 = 42,812.60/x
  3. Step 3: Cross multiply
    72,385.70x = 108,542.10 × 42,812.60
  4. Step 4: Simplify right side
    72,385.70x = 4,646,969,510.46
  5. Step 5: Solve for x
    x = 4,646,969,510.46/72,385.70
  6. Step 6: Final answer
    x = 64,197.34

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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.