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Finding the Fourth Proportional to 159.12, 218.33 and 156.39

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Solution

The fourth proportional to 159.12, 218.33 and 156.39 is: 214.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.12 : 218.33 = 156.39 : x
  2. Step 2: Convert to fraction form
    159.12/218.33 = 156.39/x
  3. Step 3: Cross multiply
    159.12x = 218.33 × 156.39
  4. Step 4: Simplify right side
    159.12x = 34,143.85
  5. Step 5: Solve for x
    x = 34,143.85/159.12
  6. Step 6: Final answer
    x = 214.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.