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Finding the Fourth Proportional to 139.69, 209.65 and 53.09

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Solution

The fourth proportional to 139.69, 209.65 and 53.09 is: 79.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.69 : 209.65 = 53.09 : x
  2. Step 2: Convert to fraction form
    139.69/209.65 = 53.09/x
  3. Step 3: Cross multiply
    139.69x = 209.65 × 53.09
  4. Step 4: Simplify right side
    139.69x = 11,129.79
  5. Step 5: Solve for x
    x = 11,129.79/139.69
  6. Step 6: Final answer
    x = 79.67

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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.