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Finding the Fourth Proportional to 781.95, 1,171.77 and 342.73

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Solution

The fourth proportional to 781.95, 1,171.77 and 342.73 is: 513.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.95 : 1,171.77 = 342.73 : x
  2. Step 2: Convert to fraction form
    781.95/1,171.77 = 342.73/x
  3. Step 3: Cross multiply
    781.95x = 1,171.77 × 342.73
  4. Step 4: Simplify right side
    781.95x = 401,600.91
  5. Step 5: Solve for x
    x = 401,600.91/781.95
  6. Step 6: Final answer
    x = 513.59

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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.