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Finding the Fourth Proportional to 768.17, 1,152.08 and 220.34

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Solution

The fourth proportional to 768.17, 1,152.08 and 220.34 is: 330.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.17 : 1,152.08 = 220.34 : x
  2. Step 2: Convert to fraction form
    768.17/1,152.08 = 220.34/x
  3. Step 3: Cross multiply
    768.17x = 1,152.08 × 220.34
  4. Step 4: Simplify right side
    768.17x = 253,842.45
  5. Step 5: Solve for x
    x = 253,842.45/768.17
  6. Step 6: Final answer
    x = 330.45

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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.