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Finding the Fourth Proportional to 108.25, 162.35 and 31.20

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Solution

The fourth proportional to 108.25, 162.35 and 31.20 is: 46.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.25 : 162.35 = 31.20 : x
  2. Step 2: Convert to fraction form
    108.25/162.35 = 31.20/x
  3. Step 3: Cross multiply
    108.25x = 162.35 × 31.20
  4. Step 4: Simplify right side
    108.25x = 5,064.77
  5. Step 5: Solve for x
    x = 5,064.77/108.25
  6. Step 6: Final answer
    x = 46.79

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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.