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Finding the Fourth Proportional to 113.08, 156.02 and 76.22

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Solution

The fourth proportional to 113.08, 156.02 and 76.22 is: 105.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.08 : 156.02 = 76.22 : x
  2. Step 2: Convert to fraction form
    113.08/156.02 = 76.22/x
  3. Step 3: Cross multiply
    113.08x = 156.02 × 76.22
  4. Step 4: Simplify right side
    113.08x = 11,891.84
  5. Step 5: Solve for x
    x = 11,891.84/113.08
  6. Step 6: Final answer
    x = 105.16

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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.