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Finding the Fourth Proportional to 615.42, 922.23 and 485.73

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Solution

The fourth proportional to 615.42, 922.23 and 485.73 is: 727.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.42 : 922.23 = 485.73 : x
  2. Step 2: Convert to fraction form
    615.42/922.23 = 485.73/x
  3. Step 3: Cross multiply
    615.42x = 922.23 × 485.73
  4. Step 4: Simplify right side
    615.42x = 447,954.78
  5. Step 5: Solve for x
    x = 447,954.78/615.42
  6. Step 6: Final answer
    x = 727.88

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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.