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Finding the Fourth Proportional to 108.66, 162.90 and 79.77

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Solution

The fourth proportional to 108.66, 162.90 and 79.77 is: 119.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.66 : 162.90 = 79.77 : x
  2. Step 2: Convert to fraction form
    108.66/162.90 = 79.77/x
  3. Step 3: Cross multiply
    108.66x = 162.90 × 79.77
  4. Step 4: Simplify right side
    108.66x = 12,994.53
  5. Step 5: Solve for x
    x = 12,994.53/108.66
  6. Step 6: Final answer
    x = 119.59

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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.