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Finding the Fourth Proportional to 155.62, 214.68 and 120.88

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Solution

The fourth proportional to 155.62, 214.68 and 120.88 is: 166.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.62 : 214.68 = 120.88 : x
  2. Step 2: Convert to fraction form
    155.62/214.68 = 120.88/x
  3. Step 3: Cross multiply
    155.62x = 214.68 × 120.88
  4. Step 4: Simplify right side
    155.62x = 25,950.52
  5. Step 5: Solve for x
    x = 25,950.52/155.62
  6. Step 6: Final answer
    x = 166.76

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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.