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Finding the Fourth Proportional to 125.45, 188.28 and 91.05

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Solution

The fourth proportional to 125.45, 188.28 and 91.05 is: 136.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.45 : 188.28 = 91.05 : x
  2. Step 2: Convert to fraction form
    125.45/188.28 = 91.05/x
  3. Step 3: Cross multiply
    125.45x = 188.28 × 91.05
  4. Step 4: Simplify right side
    125.45x = 17,142.89
  5. Step 5: Solve for x
    x = 17,142.89/125.45
  6. Step 6: Final answer
    x = 136.65

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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.