Home / 21,988.28-30,317.10-15,279.48

Finding the Fourth Proportional to 21,988.28, 30,317.10 and 15,279.48

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Solution

The fourth proportional to 21,988.28, 30,317.10 and 15,279.48 is: 21,067.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.28 : 30,317.10 = 15,279.48 : x
  2. Step 2: Convert to fraction form
    21,988.28/30,317.10 = 15,279.48/x
  3. Step 3: Cross multiply
    21,988.28x = 30,317.10 × 15,279.48
  4. Step 4: Simplify right side
    21,988.28x = 463,229,523.11
  5. Step 5: Solve for x
    x = 463,229,523.11/21,988.28
  6. Step 6: Final answer
    x = 21,067.11

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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.