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Finding the Fourth Proportional to 691.05, 953.60 and 396.26

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Solution

The fourth proportional to 691.05, 953.60 and 396.26 is: 546.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.05 : 953.60 = 396.26 : x
  2. Step 2: Convert to fraction form
    691.05/953.60 = 396.26/x
  3. Step 3: Cross multiply
    691.05x = 953.60 × 396.26
  4. Step 4: Simplify right side
    691.05x = 377,866.79
  5. Step 5: Solve for x
    x = 377,866.79/691.05
  6. Step 6: Final answer
    x = 546.80

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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.