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Finding the Fourth Proportional to 113.20, 156.22 and 61.45

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Solution

The fourth proportional to 113.20, 156.22 and 61.45 is: 84.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.20 : 156.22 = 61.45 : x
  2. Step 2: Convert to fraction form
    113.20/156.22 = 61.45/x
  3. Step 3: Cross multiply
    113.20x = 156.22 × 61.45
  4. Step 4: Simplify right side
    113.20x = 9,600.23
  5. Step 5: Solve for x
    x = 9,600.23/113.20
  6. Step 6: Final answer
    x = 84.81

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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.