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Finding the Fourth Proportional to 72,522.90, 100,081.89 and 40,689.72

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Solution

The fourth proportional to 72,522.90, 100,081.89 and 40,689.72 is: 56,151.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,522.90 : 100,081.89 = 40,689.72 : x
  2. Step 2: Convert to fraction form
    72,522.90/100,081.89 = 40,689.72/x
  3. Step 3: Cross multiply
    72,522.90x = 100,081.89 × 40,689.72
  4. Step 4: Simplify right side
    72,522.90x = 4,072,304,081.17
  5. Step 5: Solve for x
    x = 4,072,304,081.17/72,522.90
  6. Step 6: Final answer
    x = 56,151.98

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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.