Home / 20,781.97-31,156.55-10,915.86

Finding the Fourth Proportional to 20,781.97, 31,156.55 and 10,915.86

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Solution

The fourth proportional to 20,781.97, 31,156.55 and 10,915.86 is: 16,365.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.97 : 31,156.55 = 10,915.86 : x
  2. Step 2: Convert to fraction form
    20,781.97/31,156.55 = 10,915.86/x
  3. Step 3: Cross multiply
    20,781.97x = 31,156.55 × 10,915.86
  4. Step 4: Simplify right side
    20,781.97x = 340,100,641.08
  5. Step 5: Solve for x
    x = 340,100,641.08/20,781.97
  6. Step 6: Final answer
    x = 16,365.18

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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.