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Finding the Fourth Proportional to 618.61, 927.96 and 253.40

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Solution

The fourth proportional to 618.61, 927.96 and 253.40 is: 380.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.61 : 927.96 = 253.40 : x
  2. Step 2: Convert to fraction form
    618.61/927.96 = 253.40/x
  3. Step 3: Cross multiply
    618.61x = 927.96 × 253.40
  4. Step 4: Simplify right side
    618.61x = 235,145.06
  5. Step 5: Solve for x
    x = 235,145.06/618.61
  6. Step 6: Final answer
    x = 380.12

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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.