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Finding the Fourth Proportional to 386.66, 580.26 and 143.39

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Solution

The fourth proportional to 386.66, 580.26 and 143.39 is: 215.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.66 : 580.26 = 143.39 : x
  2. Step 2: Convert to fraction form
    386.66/580.26 = 143.39/x
  3. Step 3: Cross multiply
    386.66x = 580.26 × 143.39
  4. Step 4: Simplify right side
    386.66x = 83,205.47
  5. Step 5: Solve for x
    x = 83,205.47/386.66
  6. Step 6: Final answer
    x = 215.19

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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.