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Finding the Fourth Proportional to 1,181.57, 1,630.65 and 789.25

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Solution

The fourth proportional to 1,181.57, 1,630.65 and 789.25 is: 1,089.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.57 : 1,630.65 = 789.25 : x
  2. Step 2: Convert to fraction form
    1,181.57/1,630.65 = 789.25/x
  3. Step 3: Cross multiply
    1,181.57x = 1,630.65 × 789.25
  4. Step 4: Simplify right side
    1,181.57x = 1,286,990.51
  5. Step 5: Solve for x
    x = 1,286,990.51/1,181.57
  6. Step 6: Final answer
    x = 1,089.22

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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.