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Finding the Fourth Proportional to 618.80, 927.76 and 253.76

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Solution

The fourth proportional to 618.80, 927.76 and 253.76 is: 380.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.80 : 927.76 = 253.76 : x
  2. Step 2: Convert to fraction form
    618.80/927.76 = 253.76/x
  3. Step 3: Cross multiply
    618.80x = 927.76 × 253.76
  4. Step 4: Simplify right side
    618.80x = 235,428.38
  5. Step 5: Solve for x
    x = 235,428.38/618.80
  6. Step 6: Final answer
    x = 380.46

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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.