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Finding the Fourth Proportional to 618.96, 922.92 and 611.40

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Solution

The fourth proportional to 618.96, 922.92 and 611.40 is: 911.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.96 : 922.92 = 611.40 : x
  2. Step 2: Convert to fraction form
    618.96/922.92 = 611.40/x
  3. Step 3: Cross multiply
    618.96x = 922.92 × 611.40
  4. Step 4: Simplify right side
    618.96x = 564,273.29
  5. Step 5: Solve for x
    x = 564,273.29/618.96
  6. Step 6: Final answer
    x = 911.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.