Home / 15,687.30-21,649.97-8,971.61

Finding the Fourth Proportional to 15,687.30, 21,649.97 and 8,971.61

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Solution

The fourth proportional to 15,687.30, 21,649.97 and 8,971.61 is: 12,381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.30 : 21,649.97 = 8,971.61 : x
  2. Step 2: Convert to fraction form
    15,687.30/21,649.97 = 8,971.61/x
  3. Step 3: Cross multiply
    15,687.30x = 21,649.97 × 8,971.61
  4. Step 4: Simplify right side
    15,687.30x = 194,235,110.70
  5. Step 5: Solve for x
    x = 194,235,110.70/15,687.30
  6. Step 6: Final answer
    x = 12,381.68

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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.