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Finding the Fourth Proportional to 781.91, 1,173.11 and 234.12

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Solution

The fourth proportional to 781.91, 1,173.11 and 234.12 is: 351.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.91 : 1,173.11 = 234.12 : x
  2. Step 2: Convert to fraction form
    781.91/1,173.11 = 234.12/x
  3. Step 3: Cross multiply
    781.91x = 1,173.11 × 234.12
  4. Step 4: Simplify right side
    781.91x = 274,648.51
  5. Step 5: Solve for x
    x = 274,648.51/781.91
  6. Step 6: Final answer
    x = 351.25

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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.