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Finding the Fourth Proportional to 1,253.46, 1,881.96 and 789.74

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Solution

The fourth proportional to 1,253.46, 1,881.96 and 789.74 is: 1,185.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.46 : 1,881.96 = 789.74 : x
  2. Step 2: Convert to fraction form
    1,253.46/1,881.96 = 789.74/x
  3. Step 3: Cross multiply
    1,253.46x = 1,881.96 × 789.74
  4. Step 4: Simplify right side
    1,253.46x = 1,486,249.68
  5. Step 5: Solve for x
    x = 1,486,249.68/1,253.46
  6. Step 6: Final answer
    x = 1,185.72

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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.