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Finding the Fourth Proportional to 444.38, 661.86 and 421.25

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Solution

The fourth proportional to 444.38, 661.86 and 421.25 is: 627.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.38 : 661.86 = 421.25 : x
  2. Step 2: Convert to fraction form
    444.38/661.86 = 421.25/x
  3. Step 3: Cross multiply
    444.38x = 661.86 × 421.25
  4. Step 4: Simplify right side
    444.38x = 278,808.53
  5. Step 5: Solve for x
    x = 278,808.53/444.38
  6. Step 6: Final answer
    x = 627.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.