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Finding the Fourth Proportional to 265.40, 398.18 and 111.25

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Solution

The fourth proportional to 265.40, 398.18 and 111.25 is: 166.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.40 : 398.18 = 111.25 : x
  2. Step 2: Convert to fraction form
    265.40/398.18 = 111.25/x
  3. Step 3: Cross multiply
    265.40x = 398.18 × 111.25
  4. Step 4: Simplify right side
    265.40x = 44,297.53
  5. Step 5: Solve for x
    x = 44,297.53/265.40
  6. Step 6: Final answer
    x = 166.91

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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.