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Finding the Fourth Proportional to 110.64, 165.60 and 86.16

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Solution

The fourth proportional to 110.64, 165.60 and 86.16 is: 128.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.64 : 165.60 = 86.16 : x
  2. Step 2: Convert to fraction form
    110.64/165.60 = 86.16/x
  3. Step 3: Cross multiply
    110.64x = 165.60 × 86.16
  4. Step 4: Simplify right side
    110.64x = 14,268.10
  5. Step 5: Solve for x
    x = 14,268.10/110.64
  6. Step 6: Final answer
    x = 128.96

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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.