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Finding the Fourth Proportional to 251.14, 378.64 and 247.90

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Solution

The fourth proportional to 251.14, 378.64 and 247.90 is: 373.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.14 : 378.64 = 247.90 : x
  2. Step 2: Convert to fraction form
    251.14/378.64 = 247.90/x
  3. Step 3: Cross multiply
    251.14x = 378.64 × 247.90
  4. Step 4: Simplify right side
    251.14x = 93,864.86
  5. Step 5: Solve for x
    x = 93,864.86/251.14
  6. Step 6: Final answer
    x = 373.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.