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Finding the Fourth Proportional to 139.70, 209.95 and 94.32

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Solution

The fourth proportional to 139.70, 209.95 and 94.32 is: 141.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.70 : 209.95 = 94.32 : x
  2. Step 2: Convert to fraction form
    139.70/209.95 = 94.32/x
  3. Step 3: Cross multiply
    139.70x = 209.95 × 94.32
  4. Step 4: Simplify right side
    139.70x = 19,802.25
  5. Step 5: Solve for x
    x = 19,802.25/139.70
  6. Step 6: Final answer
    x = 141.75

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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.