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Finding the Fourth Proportional to 836.32, 1,253.26 and 615.20

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Solution

The fourth proportional to 836.32, 1,253.26 and 615.20 is: 921.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.32 : 1,253.26 = 615.20 : x
  2. Step 2: Convert to fraction form
    836.32/1,253.26 = 615.20/x
  3. Step 3: Cross multiply
    836.32x = 1,253.26 × 615.20
  4. Step 4: Simplify right side
    836.32x = 771,005.55
  5. Step 5: Solve for x
    x = 771,005.55/836.32
  6. Step 6: Final answer
    x = 921.90

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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.