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Finding the Fourth Proportional to 265.16, 397.61 and 91.81

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Solution

The fourth proportional to 265.16, 397.61 and 91.81 is: 137.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.16 : 397.61 = 91.81 : x
  2. Step 2: Convert to fraction form
    265.16/397.61 = 91.81/x
  3. Step 3: Cross multiply
    265.16x = 397.61 × 91.81
  4. Step 4: Simplify right side
    265.16x = 36,504.96
  5. Step 5: Solve for x
    x = 36,504.96/265.16
  6. Step 6: Final answer
    x = 137.67

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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.