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Finding the Fourth Proportional to 680.86, 939.66 and 418.84

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Solution

The fourth proportional to 680.86, 939.66 and 418.84 is: 578.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.86 : 939.66 = 418.84 : x
  2. Step 2: Convert to fraction form
    680.86/939.66 = 418.84/x
  3. Step 3: Cross multiply
    680.86x = 939.66 × 418.84
  4. Step 4: Simplify right side
    680.86x = 393,567.19
  5. Step 5: Solve for x
    x = 393,567.19/680.86
  6. Step 6: Final answer
    x = 578.04

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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.