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Finding the Fourth Proportional to 939.41, 1,408.80 and 314.57

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Solution

The fourth proportional to 939.41, 1,408.80 and 314.57 is: 471.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.41 : 1,408.80 = 314.57 : x
  2. Step 2: Convert to fraction form
    939.41/1,408.80 = 314.57/x
  3. Step 3: Cross multiply
    939.41x = 1,408.80 × 314.57
  4. Step 4: Simplify right side
    939.41x = 443,162.11
  5. Step 5: Solve for x
    x = 443,162.11/939.41
  6. Step 6: Final answer
    x = 471.75

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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.