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Finding the Fourth Proportional to 691.94, 953.55 and 679.30

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Solution

The fourth proportional to 691.94, 953.55 and 679.30 is: 936.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.94 : 953.55 = 679.30 : x
  2. Step 2: Convert to fraction form
    691.94/953.55 = 679.30/x
  3. Step 3: Cross multiply
    691.94x = 953.55 × 679.30
  4. Step 4: Simplify right side
    691.94x = 647,743.56
  5. Step 5: Solve for x
    x = 647,743.56/691.94
  6. Step 6: Final answer
    x = 936.12

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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.