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Finding the Fourth Proportional to 72,425.80, 108,687.30 and 42,812.20

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Solution

The fourth proportional to 72,425.80, 108,687.30 and 42,812.20 is: 64,247.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,425.80 : 108,687.30 = 42,812.20 : x
  2. Step 2: Convert to fraction form
    72,425.80/108,687.30 = 42,812.20/x
  3. Step 3: Cross multiply
    72,425.80x = 108,687.30 × 42,812.20
  4. Step 4: Simplify right side
    72,425.80x = 4,653,142,425.06
  5. Step 5: Solve for x
    x = 4,653,142,425.06/72,425.80
  6. Step 6: Final answer
    x = 64,247.03

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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.