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Finding the Fourth Proportional to 109.56, 151.04 and 84.90

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Solution

The fourth proportional to 109.56, 151.04 and 84.90 is: 117.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.56 : 151.04 = 84.90 : x
  2. Step 2: Convert to fraction form
    109.56/151.04 = 84.90/x
  3. Step 3: Cross multiply
    109.56x = 151.04 × 84.90
  4. Step 4: Simplify right side
    109.56x = 12,823.30
  5. Step 5: Solve for x
    x = 12,823.30/109.56
  6. Step 6: Final answer
    x = 117.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.