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Finding the Fourth Proportional to 108.18, 162.36 and 77.76

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Solution

The fourth proportional to 108.18, 162.36 and 77.76 is: 116.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.18 : 162.36 = 77.76 : x
  2. Step 2: Convert to fraction form
    108.18/162.36 = 77.76/x
  3. Step 3: Cross multiply
    108.18x = 162.36 × 77.76
  4. Step 4: Simplify right side
    108.18x = 12,625.11
  5. Step 5: Solve for x
    x = 12,625.11/108.18
  6. Step 6: Final answer
    x = 116.70

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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.