Home / 20,807.28-28,723.68-12,306.72

Finding the Fourth Proportional to 20,807.28, 28,723.68 and 12,306.72

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Solution

The fourth proportional to 20,807.28, 28,723.68 and 12,306.72 is: 16,988.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.28 : 28,723.68 = 12,306.72 : x
  2. Step 2: Convert to fraction form
    20,807.28/28,723.68 = 12,306.72/x
  3. Step 3: Cross multiply
    20,807.28x = 28,723.68 × 12,306.72
  4. Step 4: Simplify right side
    20,807.28x = 353,494,287.13
  5. Step 5: Solve for x
    x = 353,494,287.13/20,807.28
  6. Step 6: Final answer
    x = 16,988.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.