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Finding the Fourth Proportional to 426.72, 640.72 and 253.68

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Solution

The fourth proportional to 426.72, 640.72 and 253.68 is: 380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.72 : 640.72 = 253.68 : x
  2. Step 2: Convert to fraction form
    426.72/640.72 = 253.68/x
  3. Step 3: Cross multiply
    426.72x = 640.72 × 253.68
  4. Step 4: Simplify right side
    426.72x = 162,537.85
  5. Step 5: Solve for x
    x = 162,537.85/426.72
  6. Step 6: Final answer
    x = 380.90

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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.