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Finding the Fourth Proportional to 618.77, 928.29 and 207.87

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Solution

The fourth proportional to 618.77, 928.29 and 207.87 is: 311.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.77 : 928.29 = 207.87 : x
  2. Step 2: Convert to fraction form
    618.77/928.29 = 207.87/x
  3. Step 3: Cross multiply
    618.77x = 928.29 × 207.87
  4. Step 4: Simplify right side
    618.77x = 192,963.64
  5. Step 5: Solve for x
    x = 192,963.64/618.77
  6. Step 6: Final answer
    x = 311.85

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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.