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Finding the Fourth Proportional to 426.89, 640.33 and 118.74

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Solution

The fourth proportional to 426.89, 640.33 and 118.74 is: 178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.89 : 640.33 = 118.74 : x
  2. Step 2: Convert to fraction form
    426.89/640.33 = 118.74/x
  3. Step 3: Cross multiply
    426.89x = 640.33 × 118.74
  4. Step 4: Simplify right side
    426.89x = 76,035.33
  5. Step 5: Solve for x
    x = 76,035.33/426.89
  6. Step 6: Final answer
    x = 178.12

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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.