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Finding the Fourth Proportional to 125.92, 188.98 and 85.40

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Solution

The fourth proportional to 125.92, 188.98 and 85.40 is: 128.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.92 : 188.98 = 85.40 : x
  2. Step 2: Convert to fraction form
    125.92/188.98 = 85.40/x
  3. Step 3: Cross multiply
    125.92x = 188.98 × 85.40
  4. Step 4: Simplify right side
    125.92x = 16,138.89
  5. Step 5: Solve for x
    x = 16,138.89/125.92
  6. Step 6: Final answer
    x = 128.17

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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.