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Finding the Fourth Proportional to 213.78, 294.95 and 143.76

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Solution

The fourth proportional to 213.78, 294.95 and 143.76 is: 198.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.78 : 294.95 = 143.76 : x
  2. Step 2: Convert to fraction form
    213.78/294.95 = 143.76/x
  3. Step 3: Cross multiply
    213.78x = 294.95 × 143.76
  4. Step 4: Simplify right side
    213.78x = 42,402.01
  5. Step 5: Solve for x
    x = 42,402.01/213.78
  6. Step 6: Final answer
    x = 198.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.