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Finding the Fourth Proportional to 768.48, 1,154.94 and 639.30

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Solution

The fourth proportional to 768.48, 1,154.94 and 639.30 is: 960.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.48 : 1,154.94 = 639.30 : x
  2. Step 2: Convert to fraction form
    768.48/1,154.94 = 639.30/x
  3. Step 3: Cross multiply
    768.48x = 1,154.94 × 639.30
  4. Step 4: Simplify right side
    768.48x = 738,353.14
  5. Step 5: Solve for x
    x = 738,353.14/768.48
  6. Step 6: Final answer
    x = 960.80

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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.