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Finding the Fourth Proportional to 1,255.84, 1,885.92 and 679.12

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Solution

The fourth proportional to 1,255.84, 1,885.92 and 679.12 is: 1,019.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.84 : 1,885.92 = 679.12 : x
  2. Step 2: Convert to fraction form
    1,255.84/1,885.92 = 679.12/x
  3. Step 3: Cross multiply
    1,255.84x = 1,885.92 × 679.12
  4. Step 4: Simplify right side
    1,255.84x = 1,280,765.99
  5. Step 5: Solve for x
    x = 1,280,765.99/1,255.84
  6. Step 6: Final answer
    x = 1,019.85

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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.