Home / 20,915.97-31,371.18-7,766.56

Finding the Fourth Proportional to 20,915.97, 31,371.18 and 7,766.56

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Solution

The fourth proportional to 20,915.97, 31,371.18 and 7,766.56 is: 11,648.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.97 : 31,371.18 = 7,766.56 : x
  2. Step 2: Convert to fraction form
    20,915.97/31,371.18 = 7,766.56/x
  3. Step 3: Cross multiply
    20,915.97x = 31,371.18 × 7,766.56
  4. Step 4: Simplify right side
    20,915.97x = 243,646,151.74
  5. Step 5: Solve for x
    x = 243,646,151.74/20,915.97
  6. Step 6: Final answer
    x = 11,648.81

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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.