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Finding the Fourth Proportional to 215.60, 297.47 and 135.85

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Solution

The fourth proportional to 215.60, 297.47 and 135.85 is: 187.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.60 : 297.47 = 135.85 : x
  2. Step 2: Convert to fraction form
    215.60/297.47 = 135.85/x
  3. Step 3: Cross multiply
    215.60x = 297.47 × 135.85
  4. Step 4: Simplify right side
    215.60x = 40,410.62
  5. Step 5: Solve for x
    x = 40,410.62/215.60
  6. Step 6: Final answer
    x = 187.43

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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.