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Finding the Fourth Proportional to 125.78, 188.69 and 57.26

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Solution

The fourth proportional to 125.78, 188.69 and 57.26 is: 85.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.78 : 188.69 = 57.26 : x
  2. Step 2: Convert to fraction form
    125.78/188.69 = 57.26/x
  3. Step 3: Cross multiply
    125.78x = 188.69 × 57.26
  4. Step 4: Simplify right side
    125.78x = 10,804.57
  5. Step 5: Solve for x
    x = 10,804.57/125.78
  6. Step 6: Final answer
    x = 85.90

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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.