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Finding the Fourth Proportional to 140, 209.72 and 67.76

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Solution

The fourth proportional to 140, 209.72 and 67.76 is: 101.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    140 : 209.72 = 67.76 : x
  2. Step 2: Convert to fraction form
    140/209.72 = 67.76/x
  3. Step 3: Cross multiply
    140x = 209.72 × 67.76
  4. Step 4: Simplify right side
    140x = 14,210.63
  5. Step 5: Solve for x
    x = 14,210.63/140
  6. Step 6: Final answer
    x = 101.50

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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.