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Finding the Fourth Proportional to 265.69, 398.75 and 121.42

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Solution

The fourth proportional to 265.69, 398.75 and 121.42 is: 182.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.69 : 398.75 = 121.42 : x
  2. Step 2: Convert to fraction form
    265.69/398.75 = 121.42/x
  3. Step 3: Cross multiply
    265.69x = 398.75 × 121.42
  4. Step 4: Simplify right side
    265.69x = 48,416.23
  5. Step 5: Solve for x
    x = 48,416.23/265.69
  6. Step 6: Final answer
    x = 182.23

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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.