Home / 20,379.31-28,128.45-12,425.92

Finding the Fourth Proportional to 20,379.31, 28,128.45 and 12,425.92

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Solution

The fourth proportional to 20,379.31, 28,128.45 and 12,425.92 is: 17,150.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.31 : 28,128.45 = 12,425.92 : x
  2. Step 2: Convert to fraction form
    20,379.31/28,128.45 = 12,425.92/x
  3. Step 3: Cross multiply
    20,379.31x = 28,128.45 × 12,425.92
  4. Step 4: Simplify right side
    20,379.31x = 349,521,869.42
  5. Step 5: Solve for x
    x = 349,521,869.42/20,379.31
  6. Step 6: Final answer
    x = 17,150.82

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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.