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Finding the Fourth Proportional to 72,681.80, 109,022.70 and 68,304.20

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Solution

The fourth proportional to 72,681.80, 109,022.70 and 68,304.20 is: 102,456.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,681.80 : 109,022.70 = 68,304.20 : x
  2. Step 2: Convert to fraction form
    72,681.80/109,022.70 = 68,304.20/x
  3. Step 3: Cross multiply
    72,681.80x = 109,022.70 × 68,304.20
  4. Step 4: Simplify right side
    72,681.80x = 7,446,708,305.34
  5. Step 5: Solve for x
    x = 7,446,708,305.34/72,681.80
  6. Step 6: Final answer
    x = 102,456.30

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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.