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Finding the Fourth Proportional to 125.86, 188.54 and 91.70

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Solution

The fourth proportional to 125.86, 188.54 and 91.70 is: 137.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.86 : 188.54 = 91.70 : x
  2. Step 2: Convert to fraction form
    125.86/188.54 = 91.70/x
  3. Step 3: Cross multiply
    125.86x = 188.54 × 91.70
  4. Step 4: Simplify right side
    125.86x = 17,289.12
  5. Step 5: Solve for x
    x = 17,289.12/125.86
  6. Step 6: Final answer
    x = 137.37

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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.