Home / 1,115.43-1,671.30-789.18

Finding the Fourth Proportional to 1,115.43, 1,671.30 and 789.18

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Solution

The fourth proportional to 1,115.43, 1,671.30 and 789.18 is: 1,182.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.43 : 1,671.30 = 789.18 : x
  2. Step 2: Convert to fraction form
    1,115.43/1,671.30 = 789.18/x
  3. Step 3: Cross multiply
    1,115.43x = 1,671.30 × 789.18
  4. Step 4: Simplify right side
    1,115.43x = 1,318,956.53
  5. Step 5: Solve for x
    x = 1,318,956.53/1,115.43
  6. Step 6: Final answer
    x = 1,182.46

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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.