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Finding the Fourth Proportional to 140.66, 211.05 and 76.53

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Solution

The fourth proportional to 140.66, 211.05 and 76.53 is: 114.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.66 : 211.05 = 76.53 : x
  2. Step 2: Convert to fraction form
    140.66/211.05 = 76.53/x
  3. Step 3: Cross multiply
    140.66x = 211.05 × 76.53
  4. Step 4: Simplify right side
    140.66x = 16,152.06
  5. Step 5: Solve for x
    x = 16,152.06/140.66
  6. Step 6: Final answer
    x = 114.83

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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.