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Finding the Fourth Proportional to 72,410.52, 99,930.66 and 40,589.80

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Solution

The fourth proportional to 72,410.52, 99,930.66 and 40,589.80 is: 56,016.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,410.52 : 99,930.66 = 40,589.80 : x
  2. Step 2: Convert to fraction form
    72,410.52/99,930.66 = 40,589.80/x
  3. Step 3: Cross multiply
    72,410.52x = 99,930.66 × 40,589.80
  4. Step 4: Simplify right side
    72,410.52x = 4,056,165,503.27
  5. Step 5: Solve for x
    x = 4,056,165,503.27/72,410.52
  6. Step 6: Final answer
    x = 56,016.25

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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.