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Finding the Fourth Proportional to 12,986.88, 17,921.76 and 7,398

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Solution

The fourth proportional to 12,986.88, 17,921.76 and 7,398 is: 10,209.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,986.88 : 17,921.76 = 7,398 : x
  2. Step 2: Convert to fraction form
    12,986.88/17,921.76 = 7,398/x
  3. Step 3: Cross multiply
    12,986.88x = 17,921.76 × 7,398
  4. Step 4: Simplify right side
    12,986.88x = 132,585,180.48
  5. Step 5: Solve for x
    x = 132,585,180.48/12,986.88
  6. Step 6: Final answer
    x = 10,209.16

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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.