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Finding the Fourth Proportional to 139.70, 209.64 and 93.98

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Solution

The fourth proportional to 139.70, 209.64 and 93.98 is: 141.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.70 : 209.64 = 93.98 : x
  2. Step 2: Convert to fraction form
    139.70/209.64 = 93.98/x
  3. Step 3: Cross multiply
    139.70x = 209.64 × 93.98
  4. Step 4: Simplify right side
    139.70x = 19,701.97
  5. Step 5: Solve for x
    x = 19,701.97/139.70
  6. Step 6: Final answer
    x = 141.03

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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.