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Finding the Fourth Proportional to 108.17, 162.09 and 77.74

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Solution

The fourth proportional to 108.17, 162.09 and 77.74 is: 116.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.17 : 162.09 = 77.74 : x
  2. Step 2: Convert to fraction form
    108.17/162.09 = 77.74/x
  3. Step 3: Cross multiply
    108.17x = 162.09 × 77.74
  4. Step 4: Simplify right side
    108.17x = 12,600.88
  5. Step 5: Solve for x
    x = 12,600.88/108.17
  6. Step 6: Final answer
    x = 116.49

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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.