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Finding the Fourth Proportional to 691.09, 953.79 and 396.34

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Solution

The fourth proportional to 691.09, 953.79 and 396.34 is: 547.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.09 : 953.79 = 396.34 : x
  2. Step 2: Convert to fraction form
    691.09/953.79 = 396.34/x
  3. Step 3: Cross multiply
    691.09x = 953.79 × 396.34
  4. Step 4: Simplify right side
    691.09x = 378,025.13
  5. Step 5: Solve for x
    x = 378,025.13/691.09
  6. Step 6: Final answer
    x = 547.00

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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.