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Finding the Fourth Proportional to 108.34, 162.36 and 86.72

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Solution

The fourth proportional to 108.34, 162.36 and 86.72 is: 129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.34 : 162.36 = 86.72 : x
  2. Step 2: Convert to fraction form
    108.34/162.36 = 86.72/x
  3. Step 3: Cross multiply
    108.34x = 162.36 × 86.72
  4. Step 4: Simplify right side
    108.34x = 14,080.05
  5. Step 5: Solve for x
    x = 14,080.05/108.34
  6. Step 6: Final answer
    x = 129.96

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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.