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Finding the Fourth Proportional to 12,510.71, 18,773.75 and 5,115.20

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Solution

The fourth proportional to 12,510.71, 18,773.75 and 5,115.20 is: 7,675.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,510.71 : 18,773.75 = 5,115.20 : x
  2. Step 2: Convert to fraction form
    12,510.71/18,773.75 = 5,115.20/x
  3. Step 3: Cross multiply
    12,510.71x = 18,773.75 × 5,115.20
  4. Step 4: Simplify right side
    12,510.71x = 96,031,486
  5. Step 5: Solve for x
    x = 96,031,486/12,510.71
  6. Step 6: Final answer
    x = 7,675.95

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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.