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Finding the Fourth Proportional to 426.82, 640.18 and 204.40

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Solution

The fourth proportional to 426.82, 640.18 and 204.40 is: 306.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.82 : 640.18 = 204.40 : x
  2. Step 2: Convert to fraction form
    426.82/640.18 = 204.40/x
  3. Step 3: Cross multiply
    426.82x = 640.18 × 204.40
  4. Step 4: Simplify right side
    426.82x = 130,852.79
  5. Step 5: Solve for x
    x = 130,852.79/426.82
  6. Step 6: Final answer
    x = 306.58

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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.