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Finding the Fourth Proportional to 158.48, 218.72 and 109.39

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Solution

The fourth proportional to 158.48, 218.72 and 109.39 is: 150.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.48 : 218.72 = 109.39 : x
  2. Step 2: Convert to fraction form
    158.48/218.72 = 109.39/x
  3. Step 3: Cross multiply
    158.48x = 218.72 × 109.39
  4. Step 4: Simplify right side
    158.48x = 23,924.14
  5. Step 5: Solve for x
    x = 23,924.14/158.48
  6. Step 6: Final answer
    x = 150.96

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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.