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Finding the Fourth Proportional to 156.15, 215.37 and 111.96

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Solution

The fourth proportional to 156.15, 215.37 and 111.96 is: 154.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.15 : 215.37 = 111.96 : x
  2. Step 2: Convert to fraction form
    156.15/215.37 = 111.96/x
  3. Step 3: Cross multiply
    156.15x = 215.37 × 111.96
  4. Step 4: Simplify right side
    156.15x = 24,112.83
  5. Step 5: Solve for x
    x = 24,112.83/156.15
  6. Step 6: Final answer
    x = 154.42

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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.