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Finding the Fourth Proportional to 72,655, 108,346.69 and 71,990.68

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Solution

The fourth proportional to 72,655, 108,346.69 and 71,990.68 is: 107,356.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,655 : 108,346.69 = 71,990.68 : x
  2. Step 2: Convert to fraction form
    72,655/108,346.69 = 71,990.68/x
  3. Step 3: Cross multiply
    72,655x = 108,346.69 × 71,990.68
  4. Step 4: Simplify right side
    72,655x = 7,799,951,888.85
  5. Step 5: Solve for x
    x = 7,799,951,888.85/72,655
  6. Step 6: Final answer
    x = 107,356.02

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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.