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Finding the Fourth Proportional to 140.80, 211.14 and 103.66

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Solution

The fourth proportional to 140.80, 211.14 and 103.66 is: 155.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.80 : 211.14 = 103.66 : x
  2. Step 2: Convert to fraction form
    140.80/211.14 = 103.66/x
  3. Step 3: Cross multiply
    140.80x = 211.14 × 103.66
  4. Step 4: Simplify right side
    140.80x = 21,886.77
  5. Step 5: Solve for x
    x = 21,886.77/140.80
  6. Step 6: Final answer
    x = 155.45

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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.