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Finding the Fourth Proportional to 109.79, 165.35 and 99.08

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Solution

The fourth proportional to 109.79, 165.35 and 99.08 is: 149.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.79 : 165.35 = 99.08 : x
  2. Step 2: Convert to fraction form
    109.79/165.35 = 99.08/x
  3. Step 3: Cross multiply
    109.79x = 165.35 × 99.08
  4. Step 4: Simplify right side
    109.79x = 16,382.80
  5. Step 5: Solve for x
    x = 16,382.80/109.79
  6. Step 6: Final answer
    x = 149.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.