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Finding the Fourth Proportional to 691.06, 953.84 and 396.49

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Solution

The fourth proportional to 691.06, 953.84 and 396.49 is: 547.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.06 : 953.84 = 396.49 : x
  2. Step 2: Convert to fraction form
    691.06/953.84 = 396.49/x
  3. Step 3: Cross multiply
    691.06x = 953.84 × 396.49
  4. Step 4: Simplify right side
    691.06x = 378,181.27
  5. Step 5: Solve for x
    x = 378,181.27/691.06
  6. Step 6: Final answer
    x = 547.25

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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.