Home / 21,640.86-29,860.11-12,691.17

Finding the Fourth Proportional to 21,640.86, 29,860.11 and 12,691.17

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Solution

The fourth proportional to 21,640.86, 29,860.11 and 12,691.17 is: 17,511.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.86 : 29,860.11 = 12,691.17 : x
  2. Step 2: Convert to fraction form
    21,640.86/29,860.11 = 12,691.17/x
  3. Step 3: Cross multiply
    21,640.86x = 29,860.11 × 12,691.17
  4. Step 4: Simplify right side
    21,640.86x = 378,959,732.23
  5. Step 5: Solve for x
    x = 378,959,732.23/21,640.86
  6. Step 6: Final answer
    x = 17,511.31

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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.