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Finding the Fourth Proportional to 691.25, 1,036.88 and 656.65

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Solution

The fourth proportional to 691.25, 1,036.88 and 656.65 is: 984.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.25 : 1,036.88 = 656.65 : x
  2. Step 2: Convert to fraction form
    691.25/1,036.88 = 656.65/x
  3. Step 3: Cross multiply
    691.25x = 1,036.88 × 656.65
  4. Step 4: Simplify right side
    691.25x = 680,858.78
  5. Step 5: Solve for x
    x = 680,858.78/691.25
  6. Step 6: Final answer
    x = 984.97

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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.