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Finding the Fourth Proportional to 386.72, 579.69 and 249.86

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Solution

The fourth proportional to 386.72, 579.69 and 249.86 is: 374.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.72 : 579.69 = 249.86 : x
  2. Step 2: Convert to fraction form
    386.72/579.69 = 249.86/x
  3. Step 3: Cross multiply
    386.72x = 579.69 × 249.86
  4. Step 4: Simplify right side
    386.72x = 144,841.34
  5. Step 5: Solve for x
    x = 144,841.34/386.72
  6. Step 6: Final answer
    x = 374.54

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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.