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Finding the Fourth Proportional to 648.18, 893.96 and 399.05

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Solution

The fourth proportional to 648.18, 893.96 and 399.05 is: 550.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.18 : 893.96 = 399.05 : x
  2. Step 2: Convert to fraction form
    648.18/893.96 = 399.05/x
  3. Step 3: Cross multiply
    648.18x = 893.96 × 399.05
  4. Step 4: Simplify right side
    648.18x = 356,734.74
  5. Step 5: Solve for x
    x = 356,734.74/648.18
  6. Step 6: Final answer
    x = 550.36

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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.