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Finding the Fourth Proportional to 618.56, 927.69 and 289.72

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Solution

The fourth proportional to 618.56, 927.69 and 289.72 is: 434.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.56 : 927.69 = 289.72 : x
  2. Step 2: Convert to fraction form
    618.56/927.69 = 289.72/x
  3. Step 3: Cross multiply
    618.56x = 927.69 × 289.72
  4. Step 4: Simplify right side
    618.56x = 268,768.10
  5. Step 5: Solve for x
    x = 268,768.10/618.56
  6. Step 6: Final answer
    x = 434.51

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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.