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Finding the Fourth Proportional to 145.68, 217.20 and 133.62

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Solution

The fourth proportional to 145.68, 217.20 and 133.62 is: 199.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.68 : 217.20 = 133.62 : x
  2. Step 2: Convert to fraction form
    145.68/217.20 = 133.62/x
  3. Step 3: Cross multiply
    145.68x = 217.20 × 133.62
  4. Step 4: Simplify right side
    145.68x = 29,022.26
  5. Step 5: Solve for x
    x = 29,022.26/145.68
  6. Step 6: Final answer
    x = 199.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.