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Finding the Fourth Proportional to 126.92, 190.48 and 86.40

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Solution

The fourth proportional to 126.92, 190.48 and 86.40 is: 129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.92 : 190.48 = 86.40 : x
  2. Step 2: Convert to fraction form
    126.92/190.48 = 86.40/x
  3. Step 3: Cross multiply
    126.92x = 190.48 × 86.40
  4. Step 4: Simplify right side
    126.92x = 16,457.47
  5. Step 5: Solve for x
    x = 16,457.47/126.92
  6. Step 6: Final answer
    x = 129.67

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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.