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Finding the Fourth Proportional to 443.22, 612.39 and 387.87

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Solution

The fourth proportional to 443.22, 612.39 and 387.87 is: 535.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.22 : 612.39 = 387.87 : x
  2. Step 2: Convert to fraction form
    443.22/612.39 = 387.87/x
  3. Step 3: Cross multiply
    443.22x = 612.39 × 387.87
  4. Step 4: Simplify right side
    443.22x = 237,527.71
  5. Step 5: Solve for x
    x = 237,527.71/443.22
  6. Step 6: Final answer
    x = 535.91

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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.