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Finding the Fourth Proportional to 695.43, 1,043.15 and 279.15

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Solution

The fourth proportional to 695.43, 1,043.15 and 279.15 is: 418.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.43 : 1,043.15 = 279.15 : x
  2. Step 2: Convert to fraction form
    695.43/1,043.15 = 279.15/x
  3. Step 3: Cross multiply
    695.43x = 1,043.15 × 279.15
  4. Step 4: Simplify right side
    695.43x = 291,193.93
  5. Step 5: Solve for x
    x = 291,193.93/695.43
  6. Step 6: Final answer
    x = 418.73

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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.