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Finding the Fourth Proportional to 156.64, 234.78 and 129.52

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Solution

The fourth proportional to 156.64, 234.78 and 129.52 is: 194.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.64 : 234.78 = 129.52 : x
  2. Step 2: Convert to fraction form
    156.64/234.78 = 129.52/x
  3. Step 3: Cross multiply
    156.64x = 234.78 × 129.52
  4. Step 4: Simplify right side
    156.64x = 30,408.71
  5. Step 5: Solve for x
    x = 30,408.71/156.64
  6. Step 6: Final answer
    x = 194.13

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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.