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Finding the Fourth Proportional to 251.40, 378.48 and 235.20

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Solution

The fourth proportional to 251.40, 378.48 and 235.20 is: 354.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.40 : 378.48 = 235.20 : x
  2. Step 2: Convert to fraction form
    251.40/378.48 = 235.20/x
  3. Step 3: Cross multiply
    251.40x = 378.48 × 235.20
  4. Step 4: Simplify right side
    251.40x = 89,018.50
  5. Step 5: Solve for x
    x = 89,018.50/251.40
  6. Step 6: Final answer
    x = 354.09

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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.