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Finding the Fourth Proportional to 265.43, 398.11 and 70.45

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Solution

The fourth proportional to 265.43, 398.11 and 70.45 is: 105.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.43 : 398.11 = 70.45 : x
  2. Step 2: Convert to fraction form
    265.43/398.11 = 70.45/x
  3. Step 3: Cross multiply
    265.43x = 398.11 × 70.45
  4. Step 4: Simplify right side
    265.43x = 28,046.85
  5. Step 5: Solve for x
    x = 28,046.85/265.43
  6. Step 6: Final answer
    x = 105.67

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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.