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Finding the Fourth Proportional to 156.15, 234.09 and 87.62

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Solution

The fourth proportional to 156.15, 234.09 and 87.62 is: 131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.15 : 234.09 = 87.62 : x
  2. Step 2: Convert to fraction form
    156.15/234.09 = 87.62/x
  3. Step 3: Cross multiply
    156.15x = 234.09 × 87.62
  4. Step 4: Simplify right side
    156.15x = 20,509.80
  5. Step 5: Solve for x
    x = 20,509.80/156.15
  6. Step 6: Final answer
    x = 131.35

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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.