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Finding the Fourth Proportional to 647.46, 893.34 and 385.56

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Solution

The fourth proportional to 647.46, 893.34 and 385.56 is: 531.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.46 : 893.34 = 385.56 : x
  2. Step 2: Convert to fraction form
    647.46/893.34 = 385.56/x
  3. Step 3: Cross multiply
    647.46x = 893.34 × 385.56
  4. Step 4: Simplify right side
    647.46x = 344,436.17
  5. Step 5: Solve for x
    x = 344,436.17/647.46
  6. Step 6: Final answer
    x = 531.98

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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.