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Finding the Fourth Proportional to 425.41, 637.15 and 208.57

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Solution

The fourth proportional to 425.41, 637.15 and 208.57 is: 312.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.41 : 637.15 = 208.57 : x
  2. Step 2: Convert to fraction form
    425.41/637.15 = 208.57/x
  3. Step 3: Cross multiply
    425.41x = 637.15 × 208.57
  4. Step 4: Simplify right side
    425.41x = 132,890.38
  5. Step 5: Solve for x
    x = 132,890.38/425.41
  6. Step 6: Final answer
    x = 312.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.