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Finding the Fourth Proportional to 140.21, 211.39 and 127.15

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Solution

The fourth proportional to 140.21, 211.39 and 127.15 is: 191.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.21 : 211.39 = 127.15 : x
  2. Step 2: Convert to fraction form
    140.21/211.39 = 127.15/x
  3. Step 3: Cross multiply
    140.21x = 211.39 × 127.15
  4. Step 4: Simplify right side
    140.21x = 26,878.24
  5. Step 5: Solve for x
    x = 26,878.24/140.21
  6. Step 6: Final answer
    x = 191.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.