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Finding the Fourth Proportional to 156.25, 234.28 and 75.15

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Solution

The fourth proportional to 156.25, 234.28 and 75.15 is: 112.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.25 : 234.28 = 75.15 : x
  2. Step 2: Convert to fraction form
    156.25/234.28 = 75.15/x
  3. Step 3: Cross multiply
    156.25x = 234.28 × 75.15
  4. Step 4: Simplify right side
    156.25x = 17,606.14
  5. Step 5: Solve for x
    x = 17,606.14/156.25
  6. Step 6: Final answer
    x = 112.68

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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.