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Finding the Fourth Proportional to 125.92, 187.40 and 121.92

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Solution

The fourth proportional to 125.92, 187.40 and 121.92 is: 181.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.92 : 187.40 = 121.92 : x
  2. Step 2: Convert to fraction form
    125.92/187.40 = 121.92/x
  3. Step 3: Cross multiply
    125.92x = 187.40 × 121.92
  4. Step 4: Simplify right side
    125.92x = 22,847.81
  5. Step 5: Solve for x
    x = 22,847.81/125.92
  6. Step 6: Final answer
    x = 181.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.