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Finding the Fourth Proportional to 145.20, 217.50 and 76.62

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Solution

The fourth proportional to 145.20, 217.50 and 76.62 is: 114.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.20 : 217.50 = 76.62 : x
  2. Step 2: Convert to fraction form
    145.20/217.50 = 76.62/x
  3. Step 3: Cross multiply
    145.20x = 217.50 × 76.62
  4. Step 4: Simplify right side
    145.20x = 16,664.85
  5. Step 5: Solve for x
    x = 16,664.85/145.20
  6. Step 6: Final answer
    x = 114.77

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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.