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Finding the Fourth Proportional to 445.11, 612.87 and 378.59

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Solution

The fourth proportional to 445.11, 612.87 and 378.59 is: 521.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.11 : 612.87 = 378.59 : x
  2. Step 2: Convert to fraction form
    445.11/612.87 = 378.59/x
  3. Step 3: Cross multiply
    445.11x = 612.87 × 378.59
  4. Step 4: Simplify right side
    445.11x = 232,023.39
  5. Step 5: Solve for x
    x = 232,023.39/445.11
  6. Step 6: Final answer
    x = 521.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.