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Finding the Fourth Proportional to 113.65, 156.89 and 74.86

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Solution

The fourth proportional to 113.65, 156.89 and 74.86 is: 103.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.65 : 156.89 = 74.86 : x
  2. Step 2: Convert to fraction form
    113.65/156.89 = 74.86/x
  3. Step 3: Cross multiply
    113.65x = 156.89 × 74.86
  4. Step 4: Simplify right side
    113.65x = 11,744.79
  5. Step 5: Solve for x
    x = 11,744.79/113.65
  6. Step 6: Final answer
    x = 103.34

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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.