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Finding the Fourth Proportional to 113.65, 156.75 and 76.75

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Solution

The fourth proportional to 113.65, 156.75 and 76.75 is: 105.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.65 : 156.75 = 76.75 : x
  2. Step 2: Convert to fraction form
    113.65/156.75 = 76.75/x
  3. Step 3: Cross multiply
    113.65x = 156.75 × 76.75
  4. Step 4: Simplify right side
    113.65x = 12,030.56
  5. Step 5: Solve for x
    x = 12,030.56/113.65
  6. Step 6: Final answer
    x = 105.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.