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Finding the Fourth Proportional to 265.28, 397.78 and 143.44

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Solution

The fourth proportional to 265.28, 397.78 and 143.44 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.28 : 397.78 = 143.44 : x
  2. Step 2: Convert to fraction form
    265.28/397.78 = 143.44/x
  3. Step 3: Cross multiply
    265.28x = 397.78 × 143.44
  4. Step 4: Simplify right side
    265.28x = 57,056.21
  5. Step 5: Solve for x
    x = 57,056.21/265.28
  6. Step 6: Final answer
    x = 215.08

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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.