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Finding the Fourth Proportional to 768.72, 1,153.08 and 220.90

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Solution

The fourth proportional to 768.72, 1,153.08 and 220.90 is: 331.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,153.08 = 220.90 : x
  2. Step 2: Convert to fraction form
    768.72/1,153.08 = 220.90/x
  3. Step 3: Cross multiply
    768.72x = 1,153.08 × 220.90
  4. Step 4: Simplify right side
    768.72x = 254,715.37
  5. Step 5: Solve for x
    x = 254,715.37/768.72
  6. Step 6: Final answer
    x = 331.35

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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.