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Finding the Fourth Proportional to 421.90, 633 and 133.36

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Solution

The fourth proportional to 421.90, 633 and 133.36 is: 200.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.90 : 633 = 133.36 : x
  2. Step 2: Convert to fraction form
    421.90/633 = 133.36/x
  3. Step 3: Cross multiply
    421.90x = 633 × 133.36
  4. Step 4: Simplify right side
    421.90x = 84,416.88
  5. Step 5: Solve for x
    x = 84,416.88/421.90
  6. Step 6: Final answer
    x = 200.09

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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.