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Finding the Fourth Proportional to 154.43, 212.80 and 144.86

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Solution

The fourth proportional to 154.43, 212.80 and 144.86 is: 199.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.43 : 212.80 = 144.86 : x
  2. Step 2: Convert to fraction form
    154.43/212.80 = 144.86/x
  3. Step 3: Cross multiply
    154.43x = 212.80 × 144.86
  4. Step 4: Simplify right side
    154.43x = 30,827.26
  5. Step 5: Solve for x
    x = 30,827.26/154.43
  6. Step 6: Final answer
    x = 199.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.