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Finding the Fourth Proportional to 980.06, 1,469.72 and 394.86

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Solution

The fourth proportional to 980.06, 1,469.72 and 394.86 is: 592.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.06 : 1,469.72 = 394.86 : x
  2. Step 2: Convert to fraction form
    980.06/1,469.72 = 394.86/x
  3. Step 3: Cross multiply
    980.06x = 1,469.72 × 394.86
  4. Step 4: Simplify right side
    980.06x = 580,336.96
  5. Step 5: Solve for x
    x = 580,336.96/980.06
  6. Step 6: Final answer
    x = 592.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.