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Finding the Fourth Proportional to 680.55, 938.90 and 414.81

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Solution

The fourth proportional to 680.55, 938.90 and 414.81 is: 572.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.55 : 938.90 = 414.81 : x
  2. Step 2: Convert to fraction form
    680.55/938.90 = 414.81/x
  3. Step 3: Cross multiply
    680.55x = 938.90 × 414.81
  4. Step 4: Simplify right side
    680.55x = 389,466.15
  5. Step 5: Solve for x
    x = 389,466.15/680.55
  6. Step 6: Final answer
    x = 572.28

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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.