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Finding the Fourth Proportional to 647.61, 893.27 and 398.84

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Solution

The fourth proportional to 647.61, 893.27 and 398.84 is: 550.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.61 : 893.27 = 398.84 : x
  2. Step 2: Convert to fraction form
    647.61/893.27 = 398.84/x
  3. Step 3: Cross multiply
    647.61x = 893.27 × 398.84
  4. Step 4: Simplify right side
    647.61x = 356,265.35
  5. Step 5: Solve for x
    x = 356,265.35/647.61
  6. Step 6: Final answer
    x = 550.12

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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.