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Finding the Fourth Proportional to 695.43, 1,043.24 and 208.62

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Solution

The fourth proportional to 695.43, 1,043.24 and 208.62 is: 312.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.43 : 1,043.24 = 208.62 : x
  2. Step 2: Convert to fraction form
    695.43/1,043.24 = 208.62/x
  3. Step 3: Cross multiply
    695.43x = 1,043.24 × 208.62
  4. Step 4: Simplify right side
    695.43x = 217,639.69
  5. Step 5: Solve for x
    x = 217,639.69/695.43
  6. Step 6: Final answer
    x = 312.96

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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.