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Finding the Fourth Proportional to 108.43, 162.30 and 86.68

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Solution

The fourth proportional to 108.43, 162.30 and 86.68 is: 129.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.43 : 162.30 = 86.68 : x
  2. Step 2: Convert to fraction form
    108.43/162.30 = 86.68/x
  3. Step 3: Cross multiply
    108.43x = 162.30 × 86.68
  4. Step 4: Simplify right side
    108.43x = 14,068.16
  5. Step 5: Solve for x
    x = 14,068.16/108.43
  6. Step 6: Final answer
    x = 129.74

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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.