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Finding the Fourth Proportional to 140.47, 209.79 and 117.67

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Solution

The fourth proportional to 140.47, 209.79 and 117.67 is: 175.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.47 : 209.79 = 117.67 : x
  2. Step 2: Convert to fraction form
    140.47/209.79 = 117.67/x
  3. Step 3: Cross multiply
    140.47x = 209.79 × 117.67
  4. Step 4: Simplify right side
    140.47x = 24,685.99
  5. Step 5: Solve for x
    x = 24,685.99/140.47
  6. Step 6: Final answer
    x = 175.74

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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.