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Finding the Fourth Proportional to 641.00, 960.11 and 421.38

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Solution

The fourth proportional to 641.00, 960.11 and 421.38 is: 631.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.00 : 960.11 = 421.38 : x
  2. Step 2: Convert to fraction form
    641.00/960.11 = 421.38/x
  3. Step 3: Cross multiply
    641.00x = 960.11 × 421.38
  4. Step 4: Simplify right side
    641.00x = 404,570.63
  5. Step 5: Solve for x
    x = 404,570.63/641.00
  6. Step 6: Final answer
    x = 631.15

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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.