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Finding the Fourth Proportional to 12,240, 16,891.20 and 6,651

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Solution

The fourth proportional to 12,240, 16,891.20 and 6,651 is: 9,178.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,240 : 16,891.20 = 6,651 : x
  2. Step 2: Convert to fraction form
    12,240/16,891.20 = 6,651/x
  3. Step 3: Cross multiply
    12,240x = 16,891.20 × 6,651
  4. Step 4: Simplify right side
    12,240x = 112,343,371.20
  5. Step 5: Solve for x
    x = 112,343,371.20/12,240
  6. Step 6: Final answer
    x = 9,178.38

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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.