Home / 21,545.97-29,718.82-13,978.78

Finding the Fourth Proportional to 21,545.97, 29,718.82 and 13,978.78

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Solution

The fourth proportional to 21,545.97, 29,718.82 and 13,978.78 is: 19,281.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,545.97 : 29,718.82 = 13,978.78 : x
  2. Step 2: Convert to fraction form
    21,545.97/29,718.82 = 13,978.78/x
  3. Step 3: Cross multiply
    21,545.97x = 29,718.82 × 13,978.78
  4. Step 4: Simplify right side
    21,545.97x = 415,432,901.26
  5. Step 5: Solve for x
    x = 415,432,901.26/21,545.97
  6. Step 6: Final answer
    x = 19,281.23

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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.