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Finding the Fourth Proportional to 836.66, 1,255.76 and 426.08

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Solution

The fourth proportional to 836.66, 1,255.76 and 426.08 is: 639.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.66 : 1,255.76 = 426.08 : x
  2. Step 2: Convert to fraction form
    836.66/1,255.76 = 426.08/x
  3. Step 3: Cross multiply
    836.66x = 1,255.76 × 426.08
  4. Step 4: Simplify right side
    836.66x = 535,052.09
  5. Step 5: Solve for x
    x = 535,052.09/836.66
  6. Step 6: Final answer
    x = 639.51

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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.