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Finding the Fourth Proportional to 768.16, 1,153.52 and 639.68

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Solution

The fourth proportional to 768.16, 1,153.52 and 639.68 is: 960.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.16 : 1,153.52 = 639.68 : x
  2. Step 2: Convert to fraction form
    768.16/1,153.52 = 639.68/x
  3. Step 3: Cross multiply
    768.16x = 1,153.52 × 639.68
  4. Step 4: Simplify right side
    768.16x = 737,883.67
  5. Step 5: Solve for x
    x = 737,883.67/768.16
  6. Step 6: Final answer
    x = 960.59

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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.