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Finding the Fourth Proportional to 386.96, 580.39 and 140.15

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Solution

The fourth proportional to 386.96, 580.39 and 140.15 is: 210.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.96 : 580.39 = 140.15 : x
  2. Step 2: Convert to fraction form
    386.96/580.39 = 140.15/x
  3. Step 3: Cross multiply
    386.96x = 580.39 × 140.15
  4. Step 4: Simplify right side
    386.96x = 81,342.76
  5. Step 5: Solve for x
    x = 81,342.76/386.96
  6. Step 6: Final answer
    x = 210.21

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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.