Home / 21,380.90-29,505.33-12,431.61

Finding the Fourth Proportional to 21,380.90, 29,505.33 and 12,431.61

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Solution

The fourth proportional to 21,380.90, 29,505.33 and 12,431.61 is: 17,155.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,380.90 : 29,505.33 = 12,431.61 : x
  2. Step 2: Convert to fraction form
    21,380.90/29,505.33 = 12,431.61/x
  3. Step 3: Cross multiply
    21,380.90x = 29,505.33 × 12,431.61
  4. Step 4: Simplify right side
    21,380.90x = 366,798,755.48
  5. Step 5: Solve for x
    x = 366,798,755.48/21,380.90
  6. Step 6: Final answer
    x = 17,155.44

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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.