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Finding the Fourth Proportional to 379.87, 569.77 and 145.62

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Solution

The fourth proportional to 379.87, 569.77 and 145.62 is: 218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.87 : 569.77 = 145.62 : x
  2. Step 2: Convert to fraction form
    379.87/569.77 = 145.62/x
  3. Step 3: Cross multiply
    379.87x = 569.77 × 145.62
  4. Step 4: Simplify right side
    379.87x = 82,969.54
  5. Step 5: Solve for x
    x = 82,969.54/379.87
  6. Step 6: Final answer
    x = 218.42

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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.