Home / 21,006.47-28,979.25-13,449.17

Finding the Fourth Proportional to 21,006.47, 28,979.25 and 13,449.17

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Solution

The fourth proportional to 21,006.47, 28,979.25 and 13,449.17 is: 18,553.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.47 : 28,979.25 = 13,449.17 : x
  2. Step 2: Convert to fraction form
    21,006.47/28,979.25 = 13,449.17/x
  3. Step 3: Cross multiply
    21,006.47x = 28,979.25 × 13,449.17
  4. Step 4: Simplify right side
    21,006.47x = 389,746,859.72
  5. Step 5: Solve for x
    x = 389,746,859.72/21,006.47
  6. Step 6: Final answer
    x = 18,553.66

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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.