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Finding the Fourth Proportional to 691.97, 1,038.00 and 198.43

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Solution

The fourth proportional to 691.97, 1,038.00 and 198.43 is: 297.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.97 : 1,038.00 = 198.43 : x
  2. Step 2: Convert to fraction form
    691.97/1,038.00 = 198.43/x
  3. Step 3: Cross multiply
    691.97x = 1,038.00 × 198.43
  4. Step 4: Simplify right side
    691.97x = 205,964.16
  5. Step 5: Solve for x
    x = 205,964.16/691.97
  6. Step 6: Final answer
    x = 297.65

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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.