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Finding the Fourth Proportional to 251.86, 378.02 and 210.98

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Solution

The fourth proportional to 251.86, 378.02 and 210.98 is: 316.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.86 : 378.02 = 210.98 : x
  2. Step 2: Convert to fraction form
    251.86/378.02 = 210.98/x
  3. Step 3: Cross multiply
    251.86x = 378.02 × 210.98
  4. Step 4: Simplify right side
    251.86x = 79,752.66
  5. Step 5: Solve for x
    x = 79,752.66/251.86
  6. Step 6: Final answer
    x = 316.65

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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.