Home / 21,120.80-29,126.76-15,755.08

Finding the Fourth Proportional to 21,120.80, 29,126.76 and 15,755.08

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Solution

The fourth proportional to 21,120.80, 29,126.76 and 15,755.08 is: 21,727.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.80 : 29,126.76 = 15,755.08 : x
  2. Step 2: Convert to fraction form
    21,120.80/29,126.76 = 15,755.08/x
  3. Step 3: Cross multiply
    21,120.80x = 29,126.76 × 15,755.08
  4. Step 4: Simplify right side
    21,120.80x = 458,894,433.94
  5. Step 5: Solve for x
    x = 458,894,433.94/21,120.80
  6. Step 6: Final answer
    x = 21,727.13

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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.