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Finding the Fourth Proportional to 426.79, 640.08 and 118.56

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Solution

The fourth proportional to 426.79, 640.08 and 118.56 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.79 : 640.08 = 118.56 : x
  2. Step 2: Convert to fraction form
    426.79/640.08 = 118.56/x
  3. Step 3: Cross multiply
    426.79x = 640.08 × 118.56
  4. Step 4: Simplify right side
    426.79x = 75,890.29
  5. Step 5: Solve for x
    x = 75,890.29/426.79
  6. Step 6: Final answer
    x = 177.82

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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.