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Finding the Fourth Proportional to 441.23, 661.03 and 421.25

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Solution

The fourth proportional to 441.23, 661.03 and 421.25 is: 631.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.23 : 661.03 = 421.25 : x
  2. Step 2: Convert to fraction form
    441.23/661.03 = 421.25/x
  3. Step 3: Cross multiply
    441.23x = 661.03 × 421.25
  4. Step 4: Simplify right side
    441.23x = 278,458.89
  5. Step 5: Solve for x
    x = 278,458.89/441.23
  6. Step 6: Final answer
    x = 631.10

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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.