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Finding the Fourth Proportional to 768.68, 1,152.91 and 639.48

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Solution

The fourth proportional to 768.68, 1,152.91 and 639.48 is: 959.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.68 : 1,152.91 = 639.48 : x
  2. Step 2: Convert to fraction form
    768.68/1,152.91 = 639.48/x
  3. Step 3: Cross multiply
    768.68x = 1,152.91 × 639.48
  4. Step 4: Simplify right side
    768.68x = 737,262.89
  5. Step 5: Solve for x
    x = 737,262.89/768.68
  6. Step 6: Final answer
    x = 959.13

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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.