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Finding the Fourth Proportional to 646.50, 892.17 and 380.95

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Solution

The fourth proportional to 646.50, 892.17 and 380.95 is: 525.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.50 : 892.17 = 380.95 : x
  2. Step 2: Convert to fraction form
    646.50/892.17 = 380.95/x
  3. Step 3: Cross multiply
    646.50x = 892.17 × 380.95
  4. Step 4: Simplify right side
    646.50x = 339,868.50
  5. Step 5: Solve for x
    x = 339,868.50/646.50
  6. Step 6: Final answer
    x = 525.71

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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.