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Finding the Fourth Proportional to 835.74, 1,251.77 and 689.15

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Solution

The fourth proportional to 835.74, 1,251.77 and 689.15 is: 1,032.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.74 : 1,251.77 = 689.15 : x
  2. Step 2: Convert to fraction form
    835.74/1,251.77 = 689.15/x
  3. Step 3: Cross multiply
    835.74x = 1,251.77 × 689.15
  4. Step 4: Simplify right side
    835.74x = 862,657.30
  5. Step 5: Solve for x
    x = 862,657.30/835.74
  6. Step 6: Final answer
    x = 1,032.21

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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.