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Finding the Fourth Proportional to 781.96, 1,171.74 and 397.48

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Solution

The fourth proportional to 781.96, 1,171.74 and 397.48 is: 595.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.96 : 1,171.74 = 397.48 : x
  2. Step 2: Convert to fraction form
    781.96/1,171.74 = 397.48/x
  3. Step 3: Cross multiply
    781.96x = 1,171.74 × 397.48
  4. Step 4: Simplify right side
    781.96x = 465,743.22
  5. Step 5: Solve for x
    x = 465,743.22/781.96
  6. Step 6: Final answer
    x = 595.61

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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.