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Finding the Fourth Proportional to 72,475.17, 108,707.90 and 19,880.25

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Solution

The fourth proportional to 72,475.17, 108,707.90 and 19,880.25 is: 29,819.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,475.17 : 108,707.90 = 19,880.25 : x
  2. Step 2: Convert to fraction form
    72,475.17/108,707.90 = 19,880.25/x
  3. Step 3: Cross multiply
    72,475.17x = 108,707.90 × 19,880.25
  4. Step 4: Simplify right side
    72,475.17x = 2,161,140,129.57
  5. Step 5: Solve for x
    x = 2,161,140,129.57/72,475.17
  6. Step 6: Final answer
    x = 29,819.04

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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.