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Finding the Fourth Proportional to 109.11, 162.90 and 85.08

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Solution

The fourth proportional to 109.11, 162.90 and 85.08 is: 127.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.11 : 162.90 = 85.08 : x
  2. Step 2: Convert to fraction form
    109.11/162.90 = 85.08/x
  3. Step 3: Cross multiply
    109.11x = 162.90 × 85.08
  4. Step 4: Simplify right side
    109.11x = 13,859.53
  5. Step 5: Solve for x
    x = 13,859.53/109.11
  6. Step 6: Final answer
    x = 127.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.