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Finding the Fourth Proportional to 647.32, 893.28 and 385.18

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Solution

The fourth proportional to 647.32, 893.28 and 385.18 is: 531.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.32 : 893.28 = 385.18 : x
  2. Step 2: Convert to fraction form
    647.32/893.28 = 385.18/x
  3. Step 3: Cross multiply
    647.32x = 893.28 × 385.18
  4. Step 4: Simplify right side
    647.32x = 344,073.59
  5. Step 5: Solve for x
    x = 344,073.59/647.32
  6. Step 6: Final answer
    x = 531.54

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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.