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Finding the Fourth Proportional to 2,765.20, 4,147.56 and 915.71

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Solution

The fourth proportional to 2,765.20, 4,147.56 and 915.71 is: 1,373.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.20 : 4,147.56 = 915.71 : x
  2. Step 2: Convert to fraction form
    2,765.20/4,147.56 = 915.71/x
  3. Step 3: Cross multiply
    2,765.20x = 4,147.56 × 915.71
  4. Step 4: Simplify right side
    2,765.20x = 3,797,944.01
  5. Step 5: Solve for x
    x = 3,797,944.01/2,765.20
  6. Step 6: Final answer
    x = 1,373.48

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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.