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Finding the Fourth Proportional to 386.02, 578.91 and 142.54

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Solution

The fourth proportional to 386.02, 578.91 and 142.54 is: 213.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.02 : 578.91 = 142.54 : x
  2. Step 2: Convert to fraction form
    386.02/578.91 = 142.54/x
  3. Step 3: Cross multiply
    386.02x = 578.91 × 142.54
  4. Step 4: Simplify right side
    386.02x = 82,517.83
  5. Step 5: Solve for x
    x = 82,517.83/386.02
  6. Step 6: Final answer
    x = 213.77

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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.