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Finding the Fourth Proportional to 781.57, 1,174.78 and 779.14

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Solution

The fourth proportional to 781.57, 1,174.78 and 779.14 is: 1,171.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.57 : 1,174.78 = 779.14 : x
  2. Step 2: Convert to fraction form
    781.57/1,174.78 = 779.14/x
  3. Step 3: Cross multiply
    781.57x = 1,174.78 × 779.14
  4. Step 4: Simplify right side
    781.57x = 915,312.22
  5. Step 5: Solve for x
    x = 915,312.22/781.57
  6. Step 6: Final answer
    x = 1,171.13

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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.