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Finding the Fourth Proportional to 425.34, 636.80 and 419.27

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Solution

The fourth proportional to 425.34, 636.80 and 419.27 is: 627.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.34 : 636.80 = 419.27 : x
  2. Step 2: Convert to fraction form
    425.34/636.80 = 419.27/x
  3. Step 3: Cross multiply
    425.34x = 636.80 × 419.27
  4. Step 4: Simplify right side
    425.34x = 266,985.86
  5. Step 5: Solve for x
    x = 266,985.86/425.34
  6. Step 6: Final answer
    x = 627.70

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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.