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Finding the Fourth Proportional to 987.93, 1,363.44 and 689.61

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Solution

The fourth proportional to 987.93, 1,363.44 and 689.61 is: 951.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.93 : 1,363.44 = 689.61 : x
  2. Step 2: Convert to fraction form
    987.93/1,363.44 = 689.61/x
  3. Step 3: Cross multiply
    987.93x = 1,363.44 × 689.61
  4. Step 4: Simplify right side
    987.93x = 940,241.86
  5. Step 5: Solve for x
    x = 940,241.86/987.93
  6. Step 6: Final answer
    x = 951.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.