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Finding the Fourth Proportional to 108.37, 149.54 and 61.74

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Solution

The fourth proportional to 108.37, 149.54 and 61.74 is: 85.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.37 : 149.54 = 61.74 : x
  2. Step 2: Convert to fraction form
    108.37/149.54 = 61.74/x
  3. Step 3: Cross multiply
    108.37x = 149.54 × 61.74
  4. Step 4: Simplify right side
    108.37x = 9,232.60
  5. Step 5: Solve for x
    x = 9,232.60/108.37
  6. Step 6: Final answer
    x = 85.20

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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.