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Finding the Fourth Proportional to 265.40, 398.34 and 143.78

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Solution

The fourth proportional to 265.40, 398.34 and 143.78 is: 215.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.40 : 398.34 = 143.78 : x
  2. Step 2: Convert to fraction form
    265.40/398.34 = 143.78/x
  3. Step 3: Cross multiply
    265.40x = 398.34 × 143.78
  4. Step 4: Simplify right side
    265.40x = 57,273.33
  5. Step 5: Solve for x
    x = 57,273.33/265.40
  6. Step 6: Final answer
    x = 215.80

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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.