Home / 21,321.38-29,424.11-11,890.55

Finding the Fourth Proportional to 21,321.38, 29,424.11 and 11,890.55

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Solution

The fourth proportional to 21,321.38, 29,424.11 and 11,890.55 is: 16,409.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.38 : 29,424.11 = 11,890.55 : x
  2. Step 2: Convert to fraction form
    21,321.38/29,424.11 = 11,890.55/x
  3. Step 3: Cross multiply
    21,321.38x = 29,424.11 × 11,890.55
  4. Step 4: Simplify right side
    21,321.38x = 349,868,644.59
  5. Step 5: Solve for x
    x = 349,868,644.59/21,321.38
  6. Step 6: Final answer
    x = 16,409.29

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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.