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Finding the Fourth Proportional to 156.97, 235.34 and 75.87

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Solution

The fourth proportional to 156.97, 235.34 and 75.87 is: 113.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.97 : 235.34 = 75.87 : x
  2. Step 2: Convert to fraction form
    156.97/235.34 = 75.87/x
  3. Step 3: Cross multiply
    156.97x = 235.34 × 75.87
  4. Step 4: Simplify right side
    156.97x = 17,855.25
  5. Step 5: Solve for x
    x = 17,855.25/156.97
  6. Step 6: Final answer
    x = 113.75

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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.