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Finding the Fourth Proportional to 791.80, 1,187.70 and 532.60

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Solution

The fourth proportional to 791.80, 1,187.70 and 532.60 is: 798.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.80 : 1,187.70 = 532.60 : x
  2. Step 2: Convert to fraction form
    791.80/1,187.70 = 532.60/x
  3. Step 3: Cross multiply
    791.80x = 1,187.70 × 532.60
  4. Step 4: Simplify right side
    791.80x = 632,569.02
  5. Step 5: Solve for x
    x = 632,569.02/791.80
  6. Step 6: Final answer
    x = 798.90

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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.