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Finding the Fourth Proportional to 647.28, 893.24 and 352.55

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Solution

The fourth proportional to 647.28, 893.24 and 352.55 is: 486.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.28 : 893.24 = 352.55 : x
  2. Step 2: Convert to fraction form
    647.28/893.24 = 352.55/x
  3. Step 3: Cross multiply
    647.28x = 893.24 × 352.55
  4. Step 4: Simplify right side
    647.28x = 314,914.88
  5. Step 5: Solve for x
    x = 314,914.88/647.28
  6. Step 6: Final answer
    x = 486.52

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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.