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Finding the Fourth Proportional to 139.43, 209.01 and 70.94

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Solution

The fourth proportional to 139.43, 209.01 and 70.94 is: 106.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.43 : 209.01 = 70.94 : x
  2. Step 2: Convert to fraction form
    139.43/209.01 = 70.94/x
  3. Step 3: Cross multiply
    139.43x = 209.01 × 70.94
  4. Step 4: Simplify right side
    139.43x = 14,827.17
  5. Step 5: Solve for x
    x = 14,827.17/139.43
  6. Step 6: Final answer
    x = 106.34

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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.