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Finding the Fourth Proportional to 618.64, 927.30 and 207.40

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Solution

The fourth proportional to 618.64, 927.30 and 207.40 is: 310.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.64 : 927.30 = 207.40 : x
  2. Step 2: Convert to fraction form
    618.64/927.30 = 207.40/x
  3. Step 3: Cross multiply
    618.64x = 927.30 × 207.40
  4. Step 4: Simplify right side
    618.64x = 192,322.02
  5. Step 5: Solve for x
    x = 192,322.02/618.64
  6. Step 6: Final answer
    x = 310.88

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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.