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Finding the Fourth Proportional to 319.14, 437.87 and 311.11

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Solution

The fourth proportional to 319.14, 437.87 and 311.11 is: 426.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.14 : 437.87 = 311.11 : x
  2. Step 2: Convert to fraction form
    319.14/437.87 = 311.11/x
  3. Step 3: Cross multiply
    319.14x = 437.87 × 311.11
  4. Step 4: Simplify right side
    319.14x = 136,225.42
  5. Step 5: Solve for x
    x = 136,225.42/319.14
  6. Step 6: Final answer
    x = 426.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.