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Finding the Fourth Proportional to 126.11, 188.93 and 85.10

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Solution

The fourth proportional to 126.11, 188.93 and 85.10 is: 127.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.11 : 188.93 = 85.10 : x
  2. Step 2: Convert to fraction form
    126.11/188.93 = 85.10/x
  3. Step 3: Cross multiply
    126.11x = 188.93 × 85.10
  4. Step 4: Simplify right side
    126.11x = 16,078.27
  5. Step 5: Solve for x
    x = 16,078.27/126.11
  6. Step 6: Final answer
    x = 127.50

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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.