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Finding the Fourth Proportional to 109.20, 150.69 and 65.56

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Solution

The fourth proportional to 109.20, 150.69 and 65.56 is: 90.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.20 : 150.69 = 65.56 : x
  2. Step 2: Convert to fraction form
    109.20/150.69 = 65.56/x
  3. Step 3: Cross multiply
    109.20x = 150.69 × 65.56
  4. Step 4: Simplify right side
    109.20x = 9,879.24
  5. Step 5: Solve for x
    x = 9,879.24/109.20
  6. Step 6: Final answer
    x = 90.47

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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.