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Finding the Fourth Proportional to 768.49, 1,150.40 and 494.78

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Solution

The fourth proportional to 768.49, 1,150.40 and 494.78 is: 740.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.49 : 1,150.40 = 494.78 : x
  2. Step 2: Convert to fraction form
    768.49/1,150.40 = 494.78/x
  3. Step 3: Cross multiply
    768.49x = 1,150.40 × 494.78
  4. Step 4: Simplify right side
    768.49x = 569,190.40
  5. Step 5: Solve for x
    x = 569,190.40/768.49
  6. Step 6: Final answer
    x = 740.66

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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.