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Finding the Fourth Proportional to 386.90, 580.42 and 170.48

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Solution

The fourth proportional to 386.90, 580.42 and 170.48 is: 255.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.90 : 580.42 = 170.48 : x
  2. Step 2: Convert to fraction form
    386.90/580.42 = 170.48/x
  3. Step 3: Cross multiply
    386.90x = 580.42 × 170.48
  4. Step 4: Simplify right side
    386.90x = 98,950.00
  5. Step 5: Solve for x
    x = 98,950.00/386.90
  6. Step 6: Final answer
    x = 255.75

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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.