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Finding the Fourth Proportional to 72,700.80, 100,326.22 and 40,869.72

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Solution

The fourth proportional to 72,700.80, 100,326.22 and 40,869.72 is: 56,399.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,700.80 : 100,326.22 = 40,869.72 : x
  2. Step 2: Convert to fraction form
    72,700.80/100,326.22 = 40,869.72/x
  3. Step 3: Cross multiply
    72,700.80x = 100,326.22 × 40,869.72
  4. Step 4: Simplify right side
    72,700.80x = 4,100,304,520.06
  5. Step 5: Solve for x
    x = 4,100,304,520.06/72,700.80
  6. Step 6: Final answer
    x = 56,399.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.