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Finding the Fourth Proportional to 691.81, 954.59 and 396.97

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Solution

The fourth proportional to 691.81, 954.59 and 396.97 is: 547.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.81 : 954.59 = 396.97 : x
  2. Step 2: Convert to fraction form
    691.81/954.59 = 396.97/x
  3. Step 3: Cross multiply
    691.81x = 954.59 × 396.97
  4. Step 4: Simplify right side
    691.81x = 378,939.22
  5. Step 5: Solve for x
    x = 378,939.22/691.81
  6. Step 6: Final answer
    x = 547.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.