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Finding the Fourth Proportional to 156.37, 215.79 and 112.18

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Solution

The fourth proportional to 156.37, 215.79 and 112.18 is: 154.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.37 : 215.79 = 112.18 : x
  2. Step 2: Convert to fraction form
    156.37/215.79 = 112.18/x
  3. Step 3: Cross multiply
    156.37x = 215.79 × 112.18
  4. Step 4: Simplify right side
    156.37x = 24,207.32
  5. Step 5: Solve for x
    x = 24,207.32/156.37
  6. Step 6: Final answer
    x = 154.81

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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.