Home / 15,521.20-21,419.36-8,447.66

Finding the Fourth Proportional to 15,521.20, 21,419.36 and 8,447.66

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Solution

The fourth proportional to 15,521.20, 21,419.36 and 8,447.66 is: 11,657.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.20 : 21,419.36 = 8,447.66 : x
  2. Step 2: Convert to fraction form
    15,521.20/21,419.36 = 8,447.66/x
  3. Step 3: Cross multiply
    15,521.20x = 21,419.36 × 8,447.66
  4. Step 4: Simplify right side
    15,521.20x = 180,943,470.70
  5. Step 5: Solve for x
    x = 180,943,470.70/15,521.20
  6. Step 6: Final answer
    x = 11,657.83

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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.