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Finding the Fourth Proportional to 265.81, 398.72 and 121.63

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Solution

The fourth proportional to 265.81, 398.72 and 121.63 is: 182.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.81 : 398.72 = 121.63 : x
  2. Step 2: Convert to fraction form
    265.81/398.72 = 121.63/x
  3. Step 3: Cross multiply
    265.81x = 398.72 × 121.63
  4. Step 4: Simplify right side
    265.81x = 48,496.31
  5. Step 5: Solve for x
    x = 48,496.31/265.81
  6. Step 6: Final answer
    x = 182.45

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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.