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Finding the Fourth Proportional to 386.12, 579.15 and 169.64

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Solution

The fourth proportional to 386.12, 579.15 and 169.64 is: 254.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.12 : 579.15 = 169.64 : x
  2. Step 2: Convert to fraction form
    386.12/579.15 = 169.64/x
  3. Step 3: Cross multiply
    386.12x = 579.15 × 169.64
  4. Step 4: Simplify right side
    386.12x = 98,247.01
  5. Step 5: Solve for x
    x = 98,247.01/386.12
  6. Step 6: Final answer
    x = 254.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.