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Finding the Fourth Proportional to 155.42, 231.61 and 144.49

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Solution

The fourth proportional to 155.42, 231.61 and 144.49 is: 215.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.42 : 231.61 = 144.49 : x
  2. Step 2: Convert to fraction form
    155.42/231.61 = 144.49/x
  3. Step 3: Cross multiply
    155.42x = 231.61 × 144.49
  4. Step 4: Simplify right side
    155.42x = 33,465.33
  5. Step 5: Solve for x
    x = 33,465.33/155.42
  6. Step 6: Final answer
    x = 215.32

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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.