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Finding the Fourth Proportional to 421.99, 633.27 and 148.09

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Solution

The fourth proportional to 421.99, 633.27 and 148.09 is: 222.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.99 : 633.27 = 148.09 : x
  2. Step 2: Convert to fraction form
    421.99/633.27 = 148.09/x
  3. Step 3: Cross multiply
    421.99x = 633.27 × 148.09
  4. Step 4: Simplify right side
    421.99x = 93,777.79
  5. Step 5: Solve for x
    x = 93,777.79/421.99
  6. Step 6: Final answer
    x = 222.23

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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.