Home / 20,637.52-28,479.89-12,139.99

Finding the Fourth Proportional to 20,637.52, 28,479.89 and 12,139.99

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Solution

The fourth proportional to 20,637.52, 28,479.89 and 12,139.99 is: 16,753.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,637.52 : 28,479.89 = 12,139.99 : x
  2. Step 2: Convert to fraction form
    20,637.52/28,479.89 = 12,139.99/x
  3. Step 3: Cross multiply
    20,637.52x = 28,479.89 × 12,139.99
  4. Step 4: Simplify right side
    20,637.52x = 345,745,579.80
  5. Step 5: Solve for x
    x = 345,745,579.80/20,637.52
  6. Step 6: Final answer
    x = 16,753.25

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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.