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Finding the Fourth Proportional to 647.75, 893.94 and 386.03

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Solution

The fourth proportional to 647.75, 893.94 and 386.03 is: 532.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.75 : 893.94 = 386.03 : x
  2. Step 2: Convert to fraction form
    647.75/893.94 = 386.03/x
  3. Step 3: Cross multiply
    647.75x = 893.94 × 386.03
  4. Step 4: Simplify right side
    647.75x = 345,087.66
  5. Step 5: Solve for x
    x = 345,087.66/647.75
  6. Step 6: Final answer
    x = 532.75

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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.