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Finding the Fourth Proportional to 1,181.32, 1,630.30 and 789

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Solution

The fourth proportional to 1,181.32, 1,630.30 and 789 is: 1,088.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.32 : 1,630.30 = 789 : x
  2. Step 2: Convert to fraction form
    1,181.32/1,630.30 = 789/x
  3. Step 3: Cross multiply
    1,181.32x = 1,630.30 × 789
  4. Step 4: Simplify right side
    1,181.32x = 1,286,306.70
  5. Step 5: Solve for x
    x = 1,286,306.70/1,181.32
  6. Step 6: Final answer
    x = 1,088.87

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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.