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Finding the Fourth Proportional to 145.39, 217.81 and 112.99

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Solution

The fourth proportional to 145.39, 217.81 and 112.99 is: 169.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.39 : 217.81 = 112.99 : x
  2. Step 2: Convert to fraction form
    145.39/217.81 = 112.99/x
  3. Step 3: Cross multiply
    145.39x = 217.81 × 112.99
  4. Step 4: Simplify right side
    145.39x = 24,610.35
  5. Step 5: Solve for x
    x = 24,610.35/145.39
  6. Step 6: Final answer
    x = 169.27

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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.