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Finding the Fourth Proportional to 791.87, 1,187.80 and 214.74

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Solution

The fourth proportional to 791.87, 1,187.80 and 214.74 is: 322.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.87 : 1,187.80 = 214.74 : x
  2. Step 2: Convert to fraction form
    791.87/1,187.80 = 214.74/x
  3. Step 3: Cross multiply
    791.87x = 1,187.80 × 214.74
  4. Step 4: Simplify right side
    791.87x = 255,069.66
  5. Step 5: Solve for x
    x = 255,069.66/791.87
  6. Step 6: Final answer
    x = 322.11

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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.