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Finding the Fourth Proportional to 215.70, 297.78 and 142.14

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Solution

The fourth proportional to 215.70, 297.78 and 142.14 is: 196.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.70 : 297.78 = 142.14 : x
  2. Step 2: Convert to fraction form
    215.70/297.78 = 142.14/x
  3. Step 3: Cross multiply
    215.70x = 297.78 × 142.14
  4. Step 4: Simplify right side
    215.70x = 42,326.45
  5. Step 5: Solve for x
    x = 42,326.45/215.70
  6. Step 6: Final answer
    x = 196.23

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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.