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Finding the Fourth Proportional to 145.28, 217.86 and 119.78

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Solution

The fourth proportional to 145.28, 217.86 and 119.78 is: 179.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.28 : 217.86 = 119.78 : x
  2. Step 2: Convert to fraction form
    145.28/217.86 = 119.78/x
  3. Step 3: Cross multiply
    145.28x = 217.86 × 119.78
  4. Step 4: Simplify right side
    145.28x = 26,095.27
  5. Step 5: Solve for x
    x = 26,095.27/145.28
  6. Step 6: Final answer
    x = 179.62

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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.