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Finding the Fourth Proportional to 21,391.74, 29,522.10 and 11,959.68

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Solution

The fourth proportional to 21,391.74, 29,522.10 and 11,959.68 is: 16,505.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,391.74 : 29,522.10 = 11,959.68 : x
  2. Step 2: Convert to fraction form
    21,391.74/29,522.10 = 11,959.68/x
  3. Step 3: Cross multiply
    21,391.74x = 29,522.10 × 11,959.68
  4. Step 4: Simplify right side
    21,391.74x = 353,074,868.93
  5. Step 5: Solve for x
    x = 353,074,868.93/21,391.74
  6. Step 6: Final answer
    x = 16,505.20

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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.