Home / 15,489.12-21,375.18-8,415.66

Finding the Fourth Proportional to 15,489.12, 21,375.18 and 8,415.66

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Solution

The fourth proportional to 15,489.12, 21,375.18 and 8,415.66 is: 11,613.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.12 : 21,375.18 = 8,415.66 : x
  2. Step 2: Convert to fraction form
    15,489.12/21,375.18 = 8,415.66/x
  3. Step 3: Cross multiply
    15,489.12x = 21,375.18 × 8,415.66
  4. Step 4: Simplify right side
    15,489.12x = 179,886,247.32
  5. Step 5: Solve for x
    x = 179,886,247.32/15,489.12
  6. Step 6: Final answer
    x = 11,613.72

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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.