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Finding the Fourth Proportional to 647.44, 893.48 and 398.88

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Solution

The fourth proportional to 647.44, 893.48 and 398.88 is: 550.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.44 : 893.48 = 398.88 : x
  2. Step 2: Convert to fraction form
    647.44/893.48 = 398.88/x
  3. Step 3: Cross multiply
    647.44x = 893.48 × 398.88
  4. Step 4: Simplify right side
    647.44x = 356,391.30
  5. Step 5: Solve for x
    x = 356,391.30/647.44
  6. Step 6: Final answer
    x = 550.46

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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.