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Finding the Fourth Proportional to 618.65, 928.22 and 207.90

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Solution

The fourth proportional to 618.65, 928.22 and 207.90 is: 311.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.65 : 928.22 = 207.90 : x
  2. Step 2: Convert to fraction form
    618.65/928.22 = 207.90/x
  3. Step 3: Cross multiply
    618.65x = 928.22 × 207.90
  4. Step 4: Simplify right side
    618.65x = 192,981.28
  5. Step 5: Solve for x
    x = 192,981.28/618.65
  6. Step 6: Final answer
    x = 311.94

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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.