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Finding the Fourth Proportional to 691.35, 1,036.93 and 197.72

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Solution

The fourth proportional to 691.35, 1,036.93 and 197.72 is: 296.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.35 : 1,036.93 = 197.72 : x
  2. Step 2: Convert to fraction form
    691.35/1,036.93 = 197.72/x
  3. Step 3: Cross multiply
    691.35x = 1,036.93 × 197.72
  4. Step 4: Simplify right side
    691.35x = 205,021.80
  5. Step 5: Solve for x
    x = 205,021.80/691.35
  6. Step 6: Final answer
    x = 296.55

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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.