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Finding the Fourth Proportional to 647.32, 893.61 and 398.85

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Solution

The fourth proportional to 647.32, 893.61 and 398.85 is: 550.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.32 : 893.61 = 398.85 : x
  2. Step 2: Convert to fraction form
    647.32/893.61 = 398.85/x
  3. Step 3: Cross multiply
    647.32x = 893.61 × 398.85
  4. Step 4: Simplify right side
    647.32x = 356,416.35
  5. Step 5: Solve for x
    x = 356,416.35/647.32
  6. Step 6: Final answer
    x = 550.60

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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.