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Finding the Fourth Proportional to 156.86, 235.31 and 79.87

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Solution

The fourth proportional to 156.86, 235.31 and 79.87 is: 119.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.86 : 235.31 = 79.87 : x
  2. Step 2: Convert to fraction form
    156.86/235.31 = 79.87/x
  3. Step 3: Cross multiply
    156.86x = 235.31 × 79.87
  4. Step 4: Simplify right side
    156.86x = 18,793.22
  5. Step 5: Solve for x
    x = 18,793.22/156.86
  6. Step 6: Final answer
    x = 119.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.