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Finding the Fourth Proportional to 779.38, 1,168.68 and 231.50

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Solution

The fourth proportional to 779.38, 1,168.68 and 231.50 is: 347.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.38 : 1,168.68 = 231.50 : x
  2. Step 2: Convert to fraction form
    779.38/1,168.68 = 231.50/x
  3. Step 3: Cross multiply
    779.38x = 1,168.68 × 231.50
  4. Step 4: Simplify right side
    779.38x = 270,549.42
  5. Step 5: Solve for x
    x = 270,549.42/779.38
  6. Step 6: Final answer
    x = 347.13

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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.