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Finding the Fourth Proportional to 15,489.98, 21,375.96 and 8,775.48

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Solution

The fourth proportional to 15,489.98, 21,375.96 and 8,775.48 is: 12,110.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.98 : 21,375.96 = 8,775.48 : x
  2. Step 2: Convert to fraction form
    15,489.98/21,375.96 = 8,775.48/x
  3. Step 3: Cross multiply
    15,489.98x = 21,375.96 × 8,775.48
  4. Step 4: Simplify right side
    15,489.98x = 187,584,309.46
  5. Step 5: Solve for x
    x = 187,584,309.46/15,489.98
  6. Step 6: Final answer
    x = 12,110.04

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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.