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Finding the Fourth Proportional to 108.41, 162.74 and 85.86

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Solution

The fourth proportional to 108.41, 162.74 and 85.86 is: 128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.41 : 162.74 = 85.86 : x
  2. Step 2: Convert to fraction form
    108.41/162.74 = 85.86/x
  3. Step 3: Cross multiply
    108.41x = 162.74 × 85.86
  4. Step 4: Simplify right side
    108.41x = 13,973.07
  5. Step 5: Solve for x
    x = 13,973.07/108.41
  6. Step 6: Final answer
    x = 128.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.