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Finding the Fourth Proportional to 110.64, 165.96 and 89.40

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Solution

The fourth proportional to 110.64, 165.96 and 89.40 is: 134.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.64 : 165.96 = 89.40 : x
  2. Step 2: Convert to fraction form
    110.64/165.96 = 89.40/x
  3. Step 3: Cross multiply
    110.64x = 165.96 × 89.40
  4. Step 4: Simplify right side
    110.64x = 14,836.82
  5. Step 5: Solve for x
    x = 14,836.82/110.64
  6. Step 6: Final answer
    x = 134.10

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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.