Home / 20,876.38-31,292.70-12,978.88

Finding the Fourth Proportional to 20,876.38, 31,292.70 and 12,978.88

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Solution

The fourth proportional to 20,876.38, 31,292.70 and 12,978.88 is: 19,454.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.38 : 31,292.70 = 12,978.88 : x
  2. Step 2: Convert to fraction form
    20,876.38/31,292.70 = 12,978.88/x
  3. Step 3: Cross multiply
    20,876.38x = 31,292.70 × 12,978.88
  4. Step 4: Simplify right side
    20,876.38x = 406,144,198.18
  5. Step 5: Solve for x
    x = 406,144,198.18/20,876.38
  6. Step 6: Final answer
    x = 19,454.72

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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.