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Finding the Fourth Proportional to 72,132.89, 99,541.54 and 40,301.99

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Solution

The fourth proportional to 72,132.89, 99,541.54 and 40,301.99 is: 55,615.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,132.89 : 99,541.54 = 40,301.99 : x
  2. Step 2: Convert to fraction form
    72,132.89/99,541.54 = 40,301.99/x
  3. Step 3: Cross multiply
    72,132.89x = 99,541.54 × 40,301.99
  4. Step 4: Simplify right side
    72,132.89x = 4,011,722,149.66
  5. Step 5: Solve for x
    x = 4,011,722,149.66/72,132.89
  6. Step 6: Final answer
    x = 55,615.71

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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.