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Finding the Fourth Proportional to 768.60, 1,153.08 and 443.52

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Solution

The fourth proportional to 768.60, 1,153.08 and 443.52 is: 665.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.60 : 1,153.08 = 443.52 : x
  2. Step 2: Convert to fraction form
    768.60/1,153.08 = 443.52/x
  3. Step 3: Cross multiply
    768.60x = 1,153.08 × 443.52
  4. Step 4: Simplify right side
    768.60x = 511,414.04
  5. Step 5: Solve for x
    x = 511,414.04/768.60
  6. Step 6: Final answer
    x = 665.38

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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.