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Finding the Fourth Proportional to 648.38, 893.78 and 554.42

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Solution

The fourth proportional to 648.38, 893.78 and 554.42 is: 764.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.38 : 893.78 = 554.42 : x
  2. Step 2: Convert to fraction form
    648.38/893.78 = 554.42/x
  3. Step 3: Cross multiply
    648.38x = 893.78 × 554.42
  4. Step 4: Simplify right side
    648.38x = 495,529.51
  5. Step 5: Solve for x
    x = 495,529.51/648.38
  6. Step 6: Final answer
    x = 764.26

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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.