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Finding the Fourth Proportional to 695.30, 1,042.86 and 208.31

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Solution

The fourth proportional to 695.30, 1,042.86 and 208.31 is: 312.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.30 : 1,042.86 = 208.31 : x
  2. Step 2: Convert to fraction form
    695.30/1,042.86 = 208.31/x
  3. Step 3: Cross multiply
    695.30x = 1,042.86 × 208.31
  4. Step 4: Simplify right side
    695.30x = 217,238.17
  5. Step 5: Solve for x
    x = 217,238.17/695.30
  6. Step 6: Final answer
    x = 312.44

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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.