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Finding the Fourth Proportional to 698.09, 1,046.97 and 211.18

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Solution

The fourth proportional to 698.09, 1,046.97 and 211.18 is: 316.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.09 : 1,046.97 = 211.18 : x
  2. Step 2: Convert to fraction form
    698.09/1,046.97 = 211.18/x
  3. Step 3: Cross multiply
    698.09x = 1,046.97 × 211.18
  4. Step 4: Simplify right side
    698.09x = 221,101.74
  5. Step 5: Solve for x
    x = 221,101.74/698.09
  6. Step 6: Final answer
    x = 316.72

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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.