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Finding the Fourth Proportional to 72,672.17, 109,008.30 and 20,081.70

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Solution

The fourth proportional to 72,672.17, 109,008.30 and 20,081.70 is: 30,122.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,672.17 : 109,008.30 = 20,081.70 : x
  2. Step 2: Convert to fraction form
    72,672.17/109,008.30 = 20,081.70/x
  3. Step 3: Cross multiply
    72,672.17x = 109,008.30 × 20,081.70
  4. Step 4: Simplify right side
    72,672.17x = 2,189,071,978.11
  5. Step 5: Solve for x
    x = 2,189,071,978.11/72,672.17
  6. Step 6: Final answer
    x = 30,122.56

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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.