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Finding the Fourth Proportional to 691.82, 1,036.51 and 616.49

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Solution

The fourth proportional to 691.82, 1,036.51 and 616.49 is: 923.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.82 : 1,036.51 = 616.49 : x
  2. Step 2: Convert to fraction form
    691.82/1,036.51 = 616.49/x
  3. Step 3: Cross multiply
    691.82x = 1,036.51 × 616.49
  4. Step 4: Simplify right side
    691.82x = 638,991.33
  5. Step 5: Solve for x
    x = 638,991.33/691.82
  6. Step 6: Final answer
    x = 923.64

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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.