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Finding the Fourth Proportional to 3,380.63, 5,070.12 and 915.29

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Solution

The fourth proportional to 3,380.63, 5,070.12 and 915.29 is: 1,372.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,380.63 : 5,070.12 = 915.29 : x
  2. Step 2: Convert to fraction form
    3,380.63/5,070.12 = 915.29/x
  3. Step 3: Cross multiply
    3,380.63x = 5,070.12 × 915.29
  4. Step 4: Simplify right side
    3,380.63x = 4,640,604.78
  5. Step 5: Solve for x
    x = 4,640,604.78/3,380.63
  6. Step 6: Final answer
    x = 1,372.71

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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.