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Finding the Fourth Proportional to 618.30, 922.92 and 545.40

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Solution

The fourth proportional to 618.30, 922.92 and 545.40 is: 814.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.30 : 922.92 = 545.40 : x
  2. Step 2: Convert to fraction form
    618.30/922.92 = 545.40/x
  3. Step 3: Cross multiply
    618.30x = 922.92 × 545.40
  4. Step 4: Simplify right side
    618.30x = 503,360.57
  5. Step 5: Solve for x
    x = 503,360.57/618.30
  6. Step 6: Final answer
    x = 814.10

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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.