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Finding the Fourth Proportional to 251.28, 377.28 and 143.20

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Solution

The fourth proportional to 251.28, 377.28 and 143.20 is: 215.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 377.28 = 143.20 : x
  2. Step 2: Convert to fraction form
    251.28/377.28 = 143.20/x
  3. Step 3: Cross multiply
    251.28x = 377.28 × 143.20
  4. Step 4: Simplify right side
    251.28x = 54,026.50
  5. Step 5: Solve for x
    x = 54,026.50/251.28
  6. Step 6: Final answer
    x = 215.01

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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.