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Finding the Fourth Proportional to 109.16, 150.67 and 76.39

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Solution

The fourth proportional to 109.16, 150.67 and 76.39 is: 105.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.16 : 150.67 = 76.39 : x
  2. Step 2: Convert to fraction form
    109.16/150.67 = 76.39/x
  3. Step 3: Cross multiply
    109.16x = 150.67 × 76.39
  4. Step 4: Simplify right side
    109.16x = 11,509.82
  5. Step 5: Solve for x
    x = 11,509.82/109.16
  6. Step 6: Final answer
    x = 105.44

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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.