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Finding the Fourth Proportional to 836.90, 1,255.26 and 426.30

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Solution

The fourth proportional to 836.90, 1,255.26 and 426.30 is: 639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.90 : 1,255.26 = 426.30 : x
  2. Step 2: Convert to fraction form
    836.90/1,255.26 = 426.30/x
  3. Step 3: Cross multiply
    836.90x = 1,255.26 × 426.30
  4. Step 4: Simplify right side
    836.90x = 535,117.34
  5. Step 5: Solve for x
    x = 535,117.34/836.90
  6. Step 6: Final answer
    x = 639.40

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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.