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Finding the Fourth Proportional to 12,428.76, 17,151.68 and 6,839.76

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Solution

The fourth proportional to 12,428.76, 17,151.68 and 6,839.76 is: 9,438.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,428.76 : 17,151.68 = 6,839.76 : x
  2. Step 2: Convert to fraction form
    12,428.76/17,151.68 = 6,839.76/x
  3. Step 3: Cross multiply
    12,428.76x = 17,151.68 × 6,839.76
  4. Step 4: Simplify right side
    12,428.76x = 117,313,374.80
  5. Step 5: Solve for x
    x = 117,313,374.80/12,428.76
  6. Step 6: Final answer
    x = 9,438.86

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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.