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Finding the Fourth Proportional to 386.74, 579.71 and 170.18

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Solution

The fourth proportional to 386.74, 579.71 and 170.18 is: 255.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.74 : 579.71 = 170.18 : x
  2. Step 2: Convert to fraction form
    386.74/579.71 = 170.18/x
  3. Step 3: Cross multiply
    386.74x = 579.71 × 170.18
  4. Step 4: Simplify right side
    386.74x = 98,655.05
  5. Step 5: Solve for x
    x = 98,655.05/386.74
  6. Step 6: Final answer
    x = 255.09

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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.