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Finding the Fourth Proportional to 141.32, 211.91 and 121.77

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Solution

The fourth proportional to 141.32, 211.91 and 121.77 is: 182.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.32 : 211.91 = 121.77 : x
  2. Step 2: Convert to fraction form
    141.32/211.91 = 121.77/x
  3. Step 3: Cross multiply
    141.32x = 211.91 × 121.77
  4. Step 4: Simplify right side
    141.32x = 25,803.67
  5. Step 5: Solve for x
    x = 25,803.67/141.32
  6. Step 6: Final answer
    x = 182.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.