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Finding the Fourth Proportional to 445.48, 615.05 and 398.77

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Solution

The fourth proportional to 445.48, 615.05 and 398.77 is: 550.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.48 : 615.05 = 398.77 : x
  2. Step 2: Convert to fraction form
    445.48/615.05 = 398.77/x
  3. Step 3: Cross multiply
    445.48x = 615.05 × 398.77
  4. Step 4: Simplify right side
    445.48x = 245,264.85
  5. Step 5: Solve for x
    x = 245,264.85/445.48
  6. Step 6: Final answer
    x = 550.56

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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.