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Finding the Fourth Proportional to 647.63, 893.96 and 385.64

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Solution

The fourth proportional to 647.63, 893.96 and 385.64 is: 532.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.63 : 893.96 = 385.64 : x
  2. Step 2: Convert to fraction form
    647.63/893.96 = 385.64/x
  3. Step 3: Cross multiply
    647.63x = 893.96 × 385.64
  4. Step 4: Simplify right side
    647.63x = 344,740.34
  5. Step 5: Solve for x
    x = 344,740.34/647.63
  6. Step 6: Final answer
    x = 532.31

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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.