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Finding the Fourth Proportional to 691.07, 953.69 and 396.37

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Solution

The fourth proportional to 691.07, 953.69 and 396.37 is: 546.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.07 : 953.69 = 396.37 : x
  2. Step 2: Convert to fraction form
    691.07/953.69 = 396.37/x
  3. Step 3: Cross multiply
    691.07x = 953.69 × 396.37
  4. Step 4: Simplify right side
    691.07x = 378,009.74
  5. Step 5: Solve for x
    x = 378,009.74/691.07
  6. Step 6: Final answer
    x = 546.99

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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.