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Finding the Fourth Proportional to 445.88, 613.85 and 387.63

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Solution

The fourth proportional to 445.88, 613.85 and 387.63 is: 533.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.88 : 613.85 = 387.63 : x
  2. Step 2: Convert to fraction form
    445.88/613.85 = 387.63/x
  3. Step 3: Cross multiply
    445.88x = 613.85 × 387.63
  4. Step 4: Simplify right side
    445.88x = 237,944.74
  5. Step 5: Solve for x
    x = 237,944.74/445.88
  6. Step 6: Final answer
    x = 533.66

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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.