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Finding the Fourth Proportional to 108.50, 149.70 and 61.86

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Solution

The fourth proportional to 108.50, 149.70 and 61.86 is: 85.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.50 : 149.70 = 61.86 : x
  2. Step 2: Convert to fraction form
    108.50/149.70 = 61.86/x
  3. Step 3: Cross multiply
    108.50x = 149.70 × 61.86
  4. Step 4: Simplify right side
    108.50x = 9,260.44
  5. Step 5: Solve for x
    x = 9,260.44/108.50
  6. Step 6: Final answer
    x = 85.35

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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.