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Finding the Fourth Proportional to 156.15, 234.38 and 87.77

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Solution

The fourth proportional to 156.15, 234.38 and 87.77 is: 131.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.15 : 234.38 = 87.77 : x
  2. Step 2: Convert to fraction form
    156.15/234.38 = 87.77/x
  3. Step 3: Cross multiply
    156.15x = 234.38 × 87.77
  4. Step 4: Simplify right side
    156.15x = 20,571.53
  5. Step 5: Solve for x
    x = 20,571.53/156.15
  6. Step 6: Final answer
    x = 131.74

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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.