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Finding the Fourth Proportional to 140.49, 211.19 and 139.81

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Solution

The fourth proportional to 140.49, 211.19 and 139.81 is: 210.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.49 : 211.19 = 139.81 : x
  2. Step 2: Convert to fraction form
    140.49/211.19 = 139.81/x
  3. Step 3: Cross multiply
    140.49x = 211.19 × 139.81
  4. Step 4: Simplify right side
    140.49x = 29,526.82
  5. Step 5: Solve for x
    x = 29,526.82/140.49
  6. Step 6: Final answer
    x = 210.17

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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.