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Finding the Fourth Proportional to 386.79, 580.45 and 170.25

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Solution

The fourth proportional to 386.79, 580.45 and 170.25 is: 255.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.79 : 580.45 = 170.25 : x
  2. Step 2: Convert to fraction form
    386.79/580.45 = 170.25/x
  3. Step 3: Cross multiply
    386.79x = 580.45 × 170.25
  4. Step 4: Simplify right side
    386.79x = 98,821.61
  5. Step 5: Solve for x
    x = 98,821.61/386.79
  6. Step 6: Final answer
    x = 255.49

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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.