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Finding the Fourth Proportional to 421.99, 633.28 and 236.70

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Solution

The fourth proportional to 421.99, 633.28 and 236.70 is: 355.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.99 : 633.28 = 236.70 : x
  2. Step 2: Convert to fraction form
    421.99/633.28 = 236.70/x
  3. Step 3: Cross multiply
    421.99x = 633.28 × 236.70
  4. Step 4: Simplify right side
    421.99x = 149,897.38
  5. Step 5: Solve for x
    x = 149,897.38/421.99
  6. Step 6: Final answer
    x = 355.22

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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.