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Finding the Fourth Proportional to 108.36, 162.45 and 42.48

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Solution

The fourth proportional to 108.36, 162.45 and 42.48 is: 63.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.36 : 162.45 = 42.48 : x
  2. Step 2: Convert to fraction form
    108.36/162.45 = 42.48/x
  3. Step 3: Cross multiply
    108.36x = 162.45 × 42.48
  4. Step 4: Simplify right side
    108.36x = 6,900.88
  5. Step 5: Solve for x
    x = 6,900.88/108.36
  6. Step 6: Final answer
    x = 63.68

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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.