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Finding the Fourth Proportional to 72,979.41, 109,503.15 and 71,800.05

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Solution

The fourth proportional to 72,979.41, 109,503.15 and 71,800.05 is: 107,733.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,979.41 : 109,503.15 = 71,800.05 : x
  2. Step 2: Convert to fraction form
    72,979.41/109,503.15 = 71,800.05/x
  3. Step 3: Cross multiply
    72,979.41x = 109,503.15 × 71,800.05
  4. Step 4: Simplify right side
    72,979.41x = 7,862,331,645.16
  5. Step 5: Solve for x
    x = 7,862,331,645.16/72,979.41
  6. Step 6: Final answer
    x = 107,733.56

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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.