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Finding the Fourth Proportional to 158.30, 218.43 and 92.79

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Solution

The fourth proportional to 158.30, 218.43 and 92.79 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.30 : 218.43 = 92.79 : x
  2. Step 2: Convert to fraction form
    158.30/218.43 = 92.79/x
  3. Step 3: Cross multiply
    158.30x = 218.43 × 92.79
  4. Step 4: Simplify right side
    158.30x = 20,268.12
  5. Step 5: Solve for x
    x = 20,268.12/158.30
  6. Step 6: Final answer
    x = 128.04

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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.