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Finding the Fourth Proportional to 647.12, 893.03 and 381.57

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Solution

The fourth proportional to 647.12, 893.03 and 381.57 is: 526.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.12 : 893.03 = 381.57 : x
  2. Step 2: Convert to fraction form
    647.12/893.03 = 381.57/x
  3. Step 3: Cross multiply
    647.12x = 893.03 × 381.57
  4. Step 4: Simplify right side
    647.12x = 340,753.46
  5. Step 5: Solve for x
    x = 340,753.46/647.12
  6. Step 6: Final answer
    x = 526.57

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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.