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Finding the Fourth Proportional to 648.38, 894.57 and 386.21

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Solution

The fourth proportional to 648.38, 894.57 and 386.21 is: 532.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.38 : 894.57 = 386.21 : x
  2. Step 2: Convert to fraction form
    648.38/894.57 = 386.21/x
  3. Step 3: Cross multiply
    648.38x = 894.57 × 386.21
  4. Step 4: Simplify right side
    648.38x = 345,491.88
  5. Step 5: Solve for x
    x = 345,491.88/648.38
  6. Step 6: Final answer
    x = 532.85

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.