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Finding the Fourth Proportional to 564.57, 845.20 and 428.15

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Solution

The fourth proportional to 564.57, 845.20 and 428.15 is: 640.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.57 : 845.20 = 428.15 : x
  2. Step 2: Convert to fraction form
    564.57/845.20 = 428.15/x
  3. Step 3: Cross multiply
    564.57x = 845.20 × 428.15
  4. Step 4: Simplify right side
    564.57x = 361,875.03
  5. Step 5: Solve for x
    x = 361,875.03/564.57
  6. Step 6: Final answer
    x = 640.97

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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.