Home / 15,138.82-20,891.28-8,424.38

Finding the Fourth Proportional to 15,138.82, 20,891.28 and 8,424.38

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Solution

The fourth proportional to 15,138.82, 20,891.28 and 8,424.38 is: 11,625.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.82 : 20,891.28 = 8,424.38 : x
  2. Step 2: Convert to fraction form
    15,138.82/20,891.28 = 8,424.38/x
  3. Step 3: Cross multiply
    15,138.82x = 20,891.28 × 8,424.38
  4. Step 4: Simplify right side
    15,138.82x = 175,996,106.47
  5. Step 5: Solve for x
    x = 175,996,106.47/15,138.82
  6. Step 6: Final answer
    x = 11,625.49

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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.