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Finding the Fourth Proportional to 769, 1,153.48 and 221.18

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Solution

The fourth proportional to 769, 1,153.48 and 221.18 is: 331.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    769 : 1,153.48 = 221.18 : x
  2. Step 2: Convert to fraction form
    769/1,153.48 = 221.18/x
  3. Step 3: Cross multiply
    769x = 1,153.48 × 221.18
  4. Step 4: Simplify right side
    769x = 255,126.71
  5. Step 5: Solve for x
    x = 255,126.71/769
  6. Step 6: Final answer
    x = 331.76

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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.