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Finding the Fourth Proportional to 39,880.80, 59,869.80 and 20,149.20

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Solution

The fourth proportional to 39,880.80, 59,869.80 and 20,149.20 is: 30,248.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,880.80 : 59,869.80 = 20,149.20 : x
  2. Step 2: Convert to fraction form
    39,880.80/59,869.80 = 20,149.20/x
  3. Step 3: Cross multiply
    39,880.80x = 59,869.80 × 20,149.20
  4. Step 4: Simplify right side
    39,880.80x = 1,206,328,574.16
  5. Step 5: Solve for x
    x = 1,206,328,574.16/39,880.80
  6. Step 6: Final answer
    x = 30,248.35

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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.