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Finding the Fourth Proportional to 72,689.20, 108,904.20 and 62,321.20

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Solution

The fourth proportional to 72,689.20, 108,904.20 and 62,321.20 is: 93,370.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689.20 : 108,904.20 = 62,321.20 : x
  2. Step 2: Convert to fraction form
    72,689.20/108,904.20 = 62,321.20/x
  3. Step 3: Cross multiply
    72,689.20x = 108,904.20 × 62,321.20
  4. Step 4: Simplify right side
    72,689.20x = 6,787,040,429.04
  5. Step 5: Solve for x
    x = 6,787,040,429.04/72,689.20
  6. Step 6: Final answer
    x = 93,370.69

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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.