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Finding the Fourth Proportional to 125.45, 188.21 and 79.16

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Solution

The fourth proportional to 125.45, 188.21 and 79.16 is: 118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.45 : 188.21 = 79.16 : x
  2. Step 2: Convert to fraction form
    125.45/188.21 = 79.16/x
  3. Step 3: Cross multiply
    125.45x = 188.21 × 79.16
  4. Step 4: Simplify right side
    125.45x = 14,897.96
  5. Step 5: Solve for x
    x = 14,897.96/125.45
  6. Step 6: Final answer
    x = 118.76

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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.