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Finding the Fourth Proportional to 647.25, 893.21 and 385.22

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Solution

The fourth proportional to 647.25, 893.21 and 385.22 is: 531.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.25 : 893.21 = 385.22 : x
  2. Step 2: Convert to fraction form
    647.25/893.21 = 385.22/x
  3. Step 3: Cross multiply
    647.25x = 893.21 × 385.22
  4. Step 4: Simplify right side
    647.25x = 344,075.96
  5. Step 5: Solve for x
    x = 344,075.96/647.25
  6. Step 6: Final answer
    x = 531.60

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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.