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Finding the Fourth Proportional to 145.27, 217.90 and 76.58

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Solution

The fourth proportional to 145.27, 217.90 and 76.58 is: 114.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.27 : 217.90 = 76.58 : x
  2. Step 2: Convert to fraction form
    145.27/217.90 = 76.58/x
  3. Step 3: Cross multiply
    145.27x = 217.90 × 76.58
  4. Step 4: Simplify right side
    145.27x = 16,687.63
  5. Step 5: Solve for x
    x = 16,687.63/145.27
  6. Step 6: Final answer
    x = 114.87

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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.