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Finding the Fourth Proportional to 2,763.91, 4,147.08 and 915.29

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Solution

The fourth proportional to 2,763.91, 4,147.08 and 915.29 is: 1,373.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,763.91 : 4,147.08 = 915.29 : x
  2. Step 2: Convert to fraction form
    2,763.91/4,147.08 = 915.29/x
  3. Step 3: Cross multiply
    2,763.91x = 4,147.08 × 915.29
  4. Step 4: Simplify right side
    2,763.91x = 3,795,780.85
  5. Step 5: Solve for x
    x = 3,795,780.85/2,763.91
  6. Step 6: Final answer
    x = 1,373.34

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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.