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Finding the Fourth Proportional to 426.65, 636.85 and 425.57

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Solution

The fourth proportional to 426.65, 636.85 and 425.57 is: 635.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.65 : 636.85 = 425.57 : x
  2. Step 2: Convert to fraction form
    426.65/636.85 = 425.57/x
  3. Step 3: Cross multiply
    426.65x = 636.85 × 425.57
  4. Step 4: Simplify right side
    426.65x = 271,022.13
  5. Step 5: Solve for x
    x = 271,022.13/426.65
  6. Step 6: Final answer
    x = 635.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.