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Finding the Fourth Proportional to 113.42, 156.42 and 74.60

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Solution

The fourth proportional to 113.42, 156.42 and 74.60 is: 102.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.42 : 156.42 = 74.60 : x
  2. Step 2: Convert to fraction form
    113.42/156.42 = 74.60/x
  3. Step 3: Cross multiply
    113.42x = 156.42 × 74.60
  4. Step 4: Simplify right side
    113.42x = 11,668.93
  5. Step 5: Solve for x
    x = 11,668.93/113.42
  6. Step 6: Final answer
    x = 102.88

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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.