Home / 28,000.80-42,001.20-20,637.90

Finding the Fourth Proportional to 28,000.80, 42,001.20 and 20,637.90

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Solution

The fourth proportional to 28,000.80, 42,001.20 and 20,637.90 is: 30,956.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.80 : 42,001.20 = 20,637.90 : x
  2. Step 2: Convert to fraction form
    28,000.80/42,001.20 = 20,637.90/x
  3. Step 3: Cross multiply
    28,000.80x = 42,001.20 × 20,637.90
  4. Step 4: Simplify right side
    28,000.80x = 866,816,565.48
  5. Step 5: Solve for x
    x = 866,816,565.48/28,000.80
  6. Step 6: Final answer
    x = 30,956.85

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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.