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Finding the Fourth Proportional to 647.22, 893.12 and 381.62

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Solution

The fourth proportional to 647.22, 893.12 and 381.62 is: 526.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.22 : 893.12 = 381.62 : x
  2. Step 2: Convert to fraction form
    647.22/893.12 = 381.62/x
  3. Step 3: Cross multiply
    647.22x = 893.12 × 381.62
  4. Step 4: Simplify right side
    647.22x = 340,835.64
  5. Step 5: Solve for x
    x = 340,835.64/647.22
  6. Step 6: Final answer
    x = 526.61

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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.