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Finding the Fourth Proportional to 72,654, 108,345.20 and 71,989.68

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Solution

The fourth proportional to 72,654, 108,345.20 and 71,989.68 is: 107,354.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,654 : 108,345.20 = 71,989.68 : x
  2. Step 2: Convert to fraction form
    72,654/108,345.20 = 71,989.68/x
  3. Step 3: Cross multiply
    72,654x = 108,345.20 × 71,989.68
  4. Step 4: Simplify right side
    72,654x = 7,799,736,277.54
  5. Step 5: Solve for x
    x = 7,799,736,277.54/72,654
  6. Step 6: Final answer
    x = 107,354.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.