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Finding the Fourth Proportional to 115.39, 158.51 and 109.54

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Solution

The fourth proportional to 115.39, 158.51 and 109.54 is: 150.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.39 : 158.51 = 109.54 : x
  2. Step 2: Convert to fraction form
    115.39/158.51 = 109.54/x
  3. Step 3: Cross multiply
    115.39x = 158.51 × 109.54
  4. Step 4: Simplify right side
    115.39x = 17,363.19
  5. Step 5: Solve for x
    x = 17,363.19/115.39
  6. Step 6: Final answer
    x = 150.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.