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Finding the Fourth Proportional to 386.95, 580.09 and 143.32

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Solution

The fourth proportional to 386.95, 580.09 and 143.32 is: 214.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.95 : 580.09 = 143.32 : x
  2. Step 2: Convert to fraction form
    386.95/580.09 = 143.32/x
  3. Step 3: Cross multiply
    386.95x = 580.09 × 143.32
  4. Step 4: Simplify right side
    386.95x = 83,138.50
  5. Step 5: Solve for x
    x = 83,138.50/386.95
  6. Step 6: Final answer
    x = 214.86

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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.