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Finding the Fourth Proportional to 25,800.52, 38,700.78 and 20,639.20

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Solution

The fourth proportional to 25,800.52, 38,700.78 and 20,639.20 is: 30,958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,800.52 : 38,700.78 = 20,639.20 : x
  2. Step 2: Convert to fraction form
    25,800.52/38,700.78 = 20,639.20/x
  3. Step 3: Cross multiply
    25,800.52x = 38,700.78 × 20,639.20
  4. Step 4: Simplify right side
    25,800.52x = 798,753,138.58
  5. Step 5: Solve for x
    x = 798,753,138.58/25,800.52
  6. Step 6: Final answer
    x = 30,958.80

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1.5x scale

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.