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Finding the Fourth Proportional to 215.75, 297.63 and 142.05

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Solution

The fourth proportional to 215.75, 297.63 and 142.05 is: 195.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.75 : 297.63 = 142.05 : x
  2. Step 2: Convert to fraction form
    215.75/297.63 = 142.05/x
  3. Step 3: Cross multiply
    215.75x = 297.63 × 142.05
  4. Step 4: Simplify right side
    215.75x = 42,278.34
  5. Step 5: Solve for x
    x = 42,278.34/215.75
  6. Step 6: Final answer
    x = 195.96

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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.