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Finding the Fourth Proportional to 836.67, 1,254.91 and 426.12

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Solution

The fourth proportional to 836.67, 1,254.91 and 426.12 is: 639.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.67 : 1,254.91 = 426.12 : x
  2. Step 2: Convert to fraction form
    836.67/1,254.91 = 426.12/x
  3. Step 3: Cross multiply
    836.67x = 1,254.91 × 426.12
  4. Step 4: Simplify right side
    836.67x = 534,742.25
  5. Step 5: Solve for x
    x = 534,742.25/836.67
  6. Step 6: Final answer
    x = 639.13

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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.