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Finding the Fourth Proportional to 647.31, 893.39 and 411.45

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Solution

The fourth proportional to 647.31, 893.39 and 411.45 is: 567.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.31 : 893.39 = 411.45 : x
  2. Step 2: Convert to fraction form
    647.31/893.39 = 411.45/x
  3. Step 3: Cross multiply
    647.31x = 893.39 × 411.45
  4. Step 4: Simplify right side
    647.31x = 367,583.26
  5. Step 5: Solve for x
    x = 367,583.26/647.31
  6. Step 6: Final answer
    x = 567.86

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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.