Home / 21,120.76-29,143.20-11,687.52

Finding the Fourth Proportional to 21,120.76, 29,143.20 and 11,687.52

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Solution

The fourth proportional to 21,120.76, 29,143.20 and 11,687.52 is: 16,126.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.76 : 29,143.20 = 11,687.52 : x
  2. Step 2: Convert to fraction form
    21,120.76/29,143.20 = 11,687.52/x
  3. Step 3: Cross multiply
    21,120.76x = 29,143.20 × 11,687.52
  4. Step 4: Simplify right side
    21,120.76x = 340,611,732.86
  5. Step 5: Solve for x
    x = 340,611,732.86/21,120.76
  6. Step 6: Final answer
    x = 16,126.87

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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.