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Finding the Fourth Proportional to 1,181.39, 1,631.14 and 789.55

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Solution

The fourth proportional to 1,181.39, 1,631.14 and 789.55 is: 1,090.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.39 : 1,631.14 = 789.55 : x
  2. Step 2: Convert to fraction form
    1,181.39/1,631.14 = 789.55/x
  3. Step 3: Cross multiply
    1,181.39x = 1,631.14 × 789.55
  4. Step 4: Simplify right side
    1,181.39x = 1,287,860.54
  5. Step 5: Solve for x
    x = 1,287,860.54/1,181.39
  6. Step 6: Final answer
    x = 1,090.13

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1.5x scale

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.