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Finding the Fourth Proportional to 626.46, 939.48 and 421.11

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Solution

The fourth proportional to 626.46, 939.48 and 421.11 is: 631.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.46 : 939.48 = 421.11 : x
  2. Step 2: Convert to fraction form
    626.46/939.48 = 421.11/x
  3. Step 3: Cross multiply
    626.46x = 939.48 × 421.11
  4. Step 4: Simplify right side
    626.46x = 395,624.42
  5. Step 5: Solve for x
    x = 395,624.42/626.46
  6. Step 6: Final answer
    x = 631.52

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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.