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Finding the Fourth Proportional to 156.21, 234.18 and 91.28

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Solution

The fourth proportional to 156.21, 234.18 and 91.28 is: 136.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.21 : 234.18 = 91.28 : x
  2. Step 2: Convert to fraction form
    156.21/234.18 = 91.28/x
  3. Step 3: Cross multiply
    156.21x = 234.18 × 91.28
  4. Step 4: Simplify right side
    156.21x = 21,374.78
  5. Step 5: Solve for x
    x = 21,374.78/156.21
  6. Step 6: Final answer
    x = 136.83

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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.