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Finding the Fourth Proportional to 791.91, 1,187.70 and 560.15

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Solution

The fourth proportional to 791.91, 1,187.70 and 560.15 is: 840.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.91 : 1,187.70 = 560.15 : x
  2. Step 2: Convert to fraction form
    791.91/1,187.70 = 560.15/x
  3. Step 3: Cross multiply
    791.91x = 1,187.70 × 560.15
  4. Step 4: Simplify right side
    791.91x = 665,286.57
  5. Step 5: Solve for x
    x = 665,286.57/791.91
  6. Step 6: Final answer
    x = 840.10

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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.