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Finding the Fourth Proportional to 139.33, 192.30 and 90.25

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Solution

The fourth proportional to 139.33, 192.30 and 90.25 is: 124.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.33 : 192.30 = 90.25 : x
  2. Step 2: Convert to fraction form
    139.33/192.30 = 90.25/x
  3. Step 3: Cross multiply
    139.33x = 192.30 × 90.25
  4. Step 4: Simplify right side
    139.33x = 17,355.08
  5. Step 5: Solve for x
    x = 17,355.08/139.33
  6. Step 6: Final answer
    x = 124.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.