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Finding the Fourth Proportional to 398.99, 601.25 and 380.77

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Solution

The fourth proportional to 398.99, 601.25 and 380.77 is: 573.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.99 : 601.25 = 380.77 : x
  2. Step 2: Convert to fraction form
    398.99/601.25 = 380.77/x
  3. Step 3: Cross multiply
    398.99x = 601.25 × 380.77
  4. Step 4: Simplify right side
    398.99x = 228,934.56
  5. Step 5: Solve for x
    x = 228,934.56/398.99
  6. Step 6: Final answer
    x = 573.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.