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Finding the Fourth Proportional to 777.20, 1,165.65 and 229.26

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Solution

The fourth proportional to 777.20, 1,165.65 and 229.26 is: 343.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.20 : 1,165.65 = 229.26 : x
  2. Step 2: Convert to fraction form
    777.20/1,165.65 = 229.26/x
  3. Step 3: Cross multiply
    777.20x = 1,165.65 × 229.26
  4. Step 4: Simplify right side
    777.20x = 267,237.80
  5. Step 5: Solve for x
    x = 267,237.80/777.20
  6. Step 6: Final answer
    x = 343.85

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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.