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Finding the Fourth Proportional to 648.21, 893.01 and 451.38

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Solution

The fourth proportional to 648.21, 893.01 and 451.38 is: 621.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.21 : 893.01 = 451.38 : x
  2. Step 2: Convert to fraction form
    648.21/893.01 = 451.38/x
  3. Step 3: Cross multiply
    648.21x = 893.01 × 451.38
  4. Step 4: Simplify right side
    648.21x = 403,086.85
  5. Step 5: Solve for x
    x = 403,086.85/648.21
  6. Step 6: Final answer
    x = 621.85

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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.