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Finding the Fourth Proportional to 647.39, 893.41 and 381.84

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Solution

The fourth proportional to 647.39, 893.41 and 381.84 is: 526.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.39 : 893.41 = 381.84 : x
  2. Step 2: Convert to fraction form
    647.39/893.41 = 381.84/x
  3. Step 3: Cross multiply
    647.39x = 893.41 × 381.84
  4. Step 4: Simplify right side
    647.39x = 341,138.72
  5. Step 5: Solve for x
    x = 341,138.72/647.39
  6. Step 6: Final answer
    x = 526.94

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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.