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Finding the Fourth Proportional to 115.55, 158.48 and 109.69

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Solution

The fourth proportional to 115.55, 158.48 and 109.69 is: 150.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.55 : 158.48 = 109.69 : x
  2. Step 2: Convert to fraction form
    115.55/158.48 = 109.69/x
  3. Step 3: Cross multiply
    115.55x = 158.48 × 109.69
  4. Step 4: Simplify right side
    115.55x = 17,383.95
  5. Step 5: Solve for x
    x = 17,383.95/115.55
  6. Step 6: Final answer
    x = 150.45

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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.