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Finding the Fourth Proportional to 647.11, 893.03 and 398.57

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Solution

The fourth proportional to 647.11, 893.03 and 398.57 is: 550.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.11 : 893.03 = 398.57 : x
  2. Step 2: Convert to fraction form
    647.11/893.03 = 398.57/x
  3. Step 3: Cross multiply
    647.11x = 893.03 × 398.57
  4. Step 4: Simplify right side
    647.11x = 355,934.97
  5. Step 5: Solve for x
    x = 355,934.97/647.11
  6. Step 6: Final answer
    x = 550.04

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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.