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Finding the Fourth Proportional to 18,701.78, 28,061.76 and 7,616.12

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Solution

The fourth proportional to 18,701.78, 28,061.76 and 7,616.12 is: 11,427.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,701.78 : 28,061.76 = 7,616.12 : x
  2. Step 2: Convert to fraction form
    18,701.78/28,061.76 = 7,616.12/x
  3. Step 3: Cross multiply
    18,701.78x = 28,061.76 × 7,616.12
  4. Step 4: Simplify right side
    18,701.78x = 213,721,591.26
  5. Step 5: Solve for x
    x = 213,721,591.26/18,701.78
  6. Step 6: Final answer
    x = 11,427.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.