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Finding the Fourth Proportional to 39,806.80, 59,839.80 and 28,200.40

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Solution

The fourth proportional to 39,806.80, 59,839.80 and 28,200.40 is: 42,392.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,806.80 : 59,839.80 = 28,200.40 : x
  2. Step 2: Convert to fraction form
    39,806.80/59,839.80 = 28,200.40/x
  3. Step 3: Cross multiply
    39,806.80x = 59,839.80 × 28,200.40
  4. Step 4: Simplify right side
    39,806.80x = 1,687,506,295.92
  5. Step 5: Solve for x
    x = 1,687,506,295.92/39,806.80
  6. Step 6: Final answer
    x = 42,392.41

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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.