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Finding the Fourth Proportional to 695.39, 1,042.90 and 208.46

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Solution

The fourth proportional to 695.39, 1,042.90 and 208.46 is: 312.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.39 : 1,042.90 = 208.46 : x
  2. Step 2: Convert to fraction form
    695.39/1,042.90 = 208.46/x
  3. Step 3: Cross multiply
    695.39x = 1,042.90 × 208.46
  4. Step 4: Simplify right side
    695.39x = 217,405.02
  5. Step 5: Solve for x
    x = 217,405.02/695.39
  6. Step 6: Final answer
    x = 312.64

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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.