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Finding the Fourth Proportional to 695.86, 1,043.60 and 208.91

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Solution

The fourth proportional to 695.86, 1,043.60 and 208.91 is: 313.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.86 : 1,043.60 = 208.91 : x
  2. Step 2: Convert to fraction form
    695.86/1,043.60 = 208.91/x
  3. Step 3: Cross multiply
    695.86x = 1,043.60 × 208.91
  4. Step 4: Simplify right side
    695.86x = 218,020.04
  5. Step 5: Solve for x
    x = 218,020.04/695.86
  6. Step 6: Final answer
    x = 313.31

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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.