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Finding the Fourth Proportional to 1,046.78, 1,445.21 and 674.31

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Solution

The fourth proportional to 1,046.78, 1,445.21 and 674.31 is: 930.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,046.78 : 1,445.21 = 674.31 : x
  2. Step 2: Convert to fraction form
    1,046.78/1,445.21 = 674.31/x
  3. Step 3: Cross multiply
    1,046.78x = 1,445.21 × 674.31
  4. Step 4: Simplify right side
    1,046.78x = 974,519.56
  5. Step 5: Solve for x
    x = 974,519.56/1,046.78
  6. Step 6: Final answer
    x = 930.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.