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Finding the Fourth Proportional to 939.19, 1,408.87 and 245.86

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Solution

The fourth proportional to 939.19, 1,408.87 and 245.86 is: 368.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.19 : 1,408.87 = 245.86 : x
  2. Step 2: Convert to fraction form
    939.19/1,408.87 = 245.86/x
  3. Step 3: Cross multiply
    939.19x = 1,408.87 × 245.86
  4. Step 4: Simplify right side
    939.19x = 346,377.73
  5. Step 5: Solve for x
    x = 346,377.73/939.19
  6. Step 6: Final answer
    x = 368.80

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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.