Home / 12,812.29-17,680.89-7,147.09

Finding the Fourth Proportional to 12,812.29, 17,680.89 and 7,147.09

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Solution

The fourth proportional to 12,812.29, 17,680.89 and 7,147.09 is: 9,862.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,812.29 : 17,680.89 = 7,147.09 : x
  2. Step 2: Convert to fraction form
    12,812.29/17,680.89 = 7,147.09/x
  3. Step 3: Cross multiply
    12,812.29x = 17,680.89 × 7,147.09
  4. Step 4: Simplify right side
    12,812.29x = 126,366,912.11
  5. Step 5: Solve for x
    x = 126,366,912.11/12,812.29
  6. Step 6: Final answer
    x = 9,862.95

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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.