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Finding the Fourth Proportional to 15,489.80, 21,375.96 and 8,776.66

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Solution

The fourth proportional to 15,489.80, 21,375.96 and 8,776.66 is: 12,111.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.80 : 21,375.96 = 8,776.66 : x
  2. Step 2: Convert to fraction form
    15,489.80/21,375.96 = 8,776.66/x
  3. Step 3: Cross multiply
    15,489.80x = 21,375.96 × 8,776.66
  4. Step 4: Simplify right side
    15,489.80x = 187,609,533.09
  5. Step 5: Solve for x
    x = 187,609,533.09/15,489.80
  6. Step 6: Final answer
    x = 12,111.81

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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.