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Finding the Fourth Proportional to 423.41, 634.34 and 421.87

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Solution

The fourth proportional to 423.41, 634.34 and 421.87 is: 632.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.41 : 634.34 = 421.87 : x
  2. Step 2: Convert to fraction form
    423.41/634.34 = 421.87/x
  3. Step 3: Cross multiply
    423.41x = 634.34 × 421.87
  4. Step 4: Simplify right side
    423.41x = 267,611.16
  5. Step 5: Solve for x
    x = 267,611.16/423.41
  6. Step 6: Final answer
    x = 632.04

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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.