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Finding the Fourth Proportional to 421.84, 632.78 and 133.25

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Solution

The fourth proportional to 421.84, 632.78 and 133.25 is: 199.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.84 : 632.78 = 133.25 : x
  2. Step 2: Convert to fraction form
    421.84/632.78 = 133.25/x
  3. Step 3: Cross multiply
    421.84x = 632.78 × 133.25
  4. Step 4: Simplify right side
    421.84x = 84,317.27
  5. Step 5: Solve for x
    x = 84,317.27/421.84
  6. Step 6: Final answer
    x = 199.88

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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.