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Finding the Fourth Proportional to 140.04, 209.15 and 139.11

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Solution

The fourth proportional to 140.04, 209.15 and 139.11 is: 207.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.04 : 209.15 = 139.11 : x
  2. Step 2: Convert to fraction form
    140.04/209.15 = 139.11/x
  3. Step 3: Cross multiply
    140.04x = 209.15 × 139.11
  4. Step 4: Simplify right side
    140.04x = 29,094.16
  5. Step 5: Solve for x
    x = 29,094.16/140.04
  6. Step 6: Final answer
    x = 207.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.