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Finding the Fourth Proportional to 265.93, 398.90 and 121.55

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Solution

The fourth proportional to 265.93, 398.90 and 121.55 is: 182.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.93 : 398.90 = 121.55 : x
  2. Step 2: Convert to fraction form
    265.93/398.90 = 121.55/x
  3. Step 3: Cross multiply
    265.93x = 398.90 × 121.55
  4. Step 4: Simplify right side
    265.93x = 48,486.30
  5. Step 5: Solve for x
    x = 48,486.30/265.93
  6. Step 6: Final answer
    x = 182.33

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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.