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Finding the Fourth Proportional to 691.99, 955.08 and 397.46

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Solution

The fourth proportional to 691.99, 955.08 and 397.46 is: 548.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.99 : 955.08 = 397.46 : x
  2. Step 2: Convert to fraction form
    691.99/955.08 = 397.46/x
  3. Step 3: Cross multiply
    691.99x = 955.08 × 397.46
  4. Step 4: Simplify right side
    691.99x = 379,606.10
  5. Step 5: Solve for x
    x = 379,606.10/691.99
  6. Step 6: Final answer
    x = 548.57

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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.