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Finding the Fourth Proportional to 11,489.80, 15,865.78 and 11,118.28

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Solution

The fourth proportional to 11,489.80, 15,865.78 and 11,118.28 is: 15,352.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,489.80 : 15,865.78 = 11,118.28 : x
  2. Step 2: Convert to fraction form
    11,489.80/15,865.78 = 11,118.28/x
  3. Step 3: Cross multiply
    11,489.80x = 15,865.78 × 11,118.28
  4. Step 4: Simplify right side
    11,489.80x = 176,400,184.46
  5. Step 5: Solve for x
    x = 176,400,184.46/11,489.80
  6. Step 6: Final answer
    x = 15,352.76

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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.