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Finding the Fourth Proportional to 768.06, 1,151.78 and 402.80

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Solution

The fourth proportional to 768.06, 1,151.78 and 402.80 is: 604.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.06 : 1,151.78 = 402.80 : x
  2. Step 2: Convert to fraction form
    768.06/1,151.78 = 402.80/x
  3. Step 3: Cross multiply
    768.06x = 1,151.78 × 402.80
  4. Step 4: Simplify right side
    768.06x = 463,936.98
  5. Step 5: Solve for x
    x = 463,936.98/768.06
  6. Step 6: Final answer
    x = 604.04

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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.