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Finding the Fourth Proportional to 110.64, 165.87 and 42.15

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Solution

The fourth proportional to 110.64, 165.87 and 42.15 is: 63.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.64 : 165.87 = 42.15 : x
  2. Step 2: Convert to fraction form
    110.64/165.87 = 42.15/x
  3. Step 3: Cross multiply
    110.64x = 165.87 × 42.15
  4. Step 4: Simplify right side
    110.64x = 6,991.42
  5. Step 5: Solve for x
    x = 6,991.42/110.64
  6. Step 6: Final answer
    x = 63.19

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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.