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Finding the Fourth Proportional to 691.85, 954.78 and 455.87

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Solution

The fourth proportional to 691.85, 954.78 and 455.87 is: 629.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.85 : 954.78 = 455.87 : x
  2. Step 2: Convert to fraction form
    691.85/954.78 = 455.87/x
  3. Step 3: Cross multiply
    691.85x = 954.78 × 455.87
  4. Step 4: Simplify right side
    691.85x = 435,255.56
  5. Step 5: Solve for x
    x = 435,255.56/691.85
  6. Step 6: Final answer
    x = 629.12

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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.