Home / 20,930.99-31,520.28-15,128.15

Finding the Fourth Proportional to 20,930.99, 31,520.28 and 15,128.15

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Solution

The fourth proportional to 20,930.99, 31,520.28 and 15,128.15 is: 22,781.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.99 : 31,520.28 = 15,128.15 : x
  2. Step 2: Convert to fraction form
    20,930.99/31,520.28 = 15,128.15/x
  3. Step 3: Cross multiply
    20,930.99x = 31,520.28 × 15,128.15
  4. Step 4: Simplify right side
    20,930.99x = 476,843,423.01
  5. Step 5: Solve for x
    x = 476,843,423.01/20,930.99
  6. Step 6: Final answer
    x = 22,781.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.