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Finding the Fourth Proportional to 691.01, 953.61 and 396.31

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Solution

The fourth proportional to 691.01, 953.61 and 396.31 is: 546.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.01 : 953.61 = 396.31 : x
  2. Step 2: Convert to fraction form
    691.01/953.61 = 396.31/x
  3. Step 3: Cross multiply
    691.01x = 953.61 × 396.31
  4. Step 4: Simplify right side
    691.01x = 377,925.18
  5. Step 5: Solve for x
    x = 377,925.18/691.01
  6. Step 6: Final answer
    x = 546.92

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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.