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Finding the Fourth Proportional to 139.15, 192.09 and 90.11

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Solution

The fourth proportional to 139.15, 192.09 and 90.11 is: 124.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.15 : 192.09 = 90.11 : x
  2. Step 2: Convert to fraction form
    139.15/192.09 = 90.11/x
  3. Step 3: Cross multiply
    139.15x = 192.09 × 90.11
  4. Step 4: Simplify right side
    139.15x = 17,310.05
  5. Step 5: Solve for x
    x = 17,310.05/139.15
  6. Step 6: Final answer
    x = 124.40

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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.