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Finding the Fourth Proportional to 695.46, 1,042.38 and 386.78

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Solution

The fourth proportional to 695.46, 1,042.38 and 386.78 is: 579.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.46 : 1,042.38 = 386.78 : x
  2. Step 2: Convert to fraction form
    695.46/1,042.38 = 386.78/x
  3. Step 3: Cross multiply
    695.46x = 1,042.38 × 386.78
  4. Step 4: Simplify right side
    695.46x = 403,166.52
  5. Step 5: Solve for x
    x = 403,166.52/695.46
  6. Step 6: Final answer
    x = 579.71

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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.