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Finding the Fourth Proportional to 646.74, 892.20 and 381.10

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Solution

The fourth proportional to 646.74, 892.20 and 381.10 is: 525.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.74 : 892.20 = 381.10 : x
  2. Step 2: Convert to fraction form
    646.74/892.20 = 381.10/x
  3. Step 3: Cross multiply
    646.74x = 892.20 × 381.10
  4. Step 4: Simplify right side
    646.74x = 340,017.42
  5. Step 5: Solve for x
    x = 340,017.42/646.74
  6. Step 6: Final answer
    x = 525.74

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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.