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Finding the Fourth Proportional to 691.64, 954.26 and 396.80

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Solution

The fourth proportional to 691.64, 954.26 and 396.80 is: 547.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.64 : 954.26 = 396.80 : x
  2. Step 2: Convert to fraction form
    691.64/954.26 = 396.80/x
  3. Step 3: Cross multiply
    691.64x = 954.26 × 396.80
  4. Step 4: Simplify right side
    691.64x = 378,650.37
  5. Step 5: Solve for x
    x = 378,650.37/691.64
  6. Step 6: Final answer
    x = 547.47

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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.