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Finding the Fourth Proportional to 140.46, 209.36 and 139.98

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Solution

The fourth proportional to 140.46, 209.36 and 139.98 is: 208.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.46 : 209.36 = 139.98 : x
  2. Step 2: Convert to fraction form
    140.46/209.36 = 139.98/x
  3. Step 3: Cross multiply
    140.46x = 209.36 × 139.98
  4. Step 4: Simplify right side
    140.46x = 29,305.51
  5. Step 5: Solve for x
    x = 29,305.51/140.46
  6. Step 6: Final answer
    x = 208.64

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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.