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Finding the Fourth Proportional to 125.60, 188.09 and 71.39

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Solution

The fourth proportional to 125.60, 188.09 and 71.39 is: 106.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.60 : 188.09 = 71.39 : x
  2. Step 2: Convert to fraction form
    125.60/188.09 = 71.39/x
  3. Step 3: Cross multiply
    125.60x = 188.09 × 71.39
  4. Step 4: Simplify right side
    125.60x = 13,427.75
  5. Step 5: Solve for x
    x = 13,427.75/125.60
  6. Step 6: Final answer
    x = 106.91

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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.