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Finding the Fourth Proportional to 768.78, 1,147.10 and 699.66

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Solution

The fourth proportional to 768.78, 1,147.10 and 699.66 is: 1,043.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.78 : 1,147.10 = 699.66 : x
  2. Step 2: Convert to fraction form
    768.78/1,147.10 = 699.66/x
  3. Step 3: Cross multiply
    768.78x = 1,147.10 × 699.66
  4. Step 4: Simplify right side
    768.78x = 802,576.49
  5. Step 5: Solve for x
    x = 802,576.49/768.78
  6. Step 6: Final answer
    x = 1,043.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.