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Finding the Fourth Proportional to 109.62, 151.56 and 90.54

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Solution

The fourth proportional to 109.62, 151.56 and 90.54 is: 125.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.62 : 151.56 = 90.54 : x
  2. Step 2: Convert to fraction form
    109.62/151.56 = 90.54/x
  3. Step 3: Cross multiply
    109.62x = 151.56 × 90.54
  4. Step 4: Simplify right side
    109.62x = 13,722.24
  5. Step 5: Solve for x
    x = 13,722.24/109.62
  6. Step 6: Final answer
    x = 125.18

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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.