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Finding the Fourth Proportional to 251.30, 376.98 and 86.78

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Solution

The fourth proportional to 251.30, 376.98 and 86.78 is: 130.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.30 : 376.98 = 86.78 : x
  2. Step 2: Convert to fraction form
    251.30/376.98 = 86.78/x
  3. Step 3: Cross multiply
    251.30x = 376.98 × 86.78
  4. Step 4: Simplify right side
    251.30x = 32,712.44
  5. Step 5: Solve for x
    x = 32,712.44/251.30
  6. Step 6: Final answer
    x = 130.18

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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.