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Finding the Fourth Proportional to 615.72, 922.14 and 443.88

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Solution

The fourth proportional to 615.72, 922.14 and 443.88 is: 664.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.72 : 922.14 = 443.88 : x
  2. Step 2: Convert to fraction form
    615.72/922.14 = 443.88/x
  3. Step 3: Cross multiply
    615.72x = 922.14 × 443.88
  4. Step 4: Simplify right side
    615.72x = 409,319.50
  5. Step 5: Solve for x
    x = 409,319.50/615.72
  6. Step 6: Final answer
    x = 664.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.