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Finding the Fourth Proportional to 986.22, 1,478.88 and 336.78

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Solution

The fourth proportional to 986.22, 1,478.88 and 336.78 is: 505.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.22 : 1,478.88 = 336.78 : x
  2. Step 2: Convert to fraction form
    986.22/1,478.88 = 336.78/x
  3. Step 3: Cross multiply
    986.22x = 1,478.88 × 336.78
  4. Step 4: Simplify right side
    986.22x = 498,057.21
  5. Step 5: Solve for x
    x = 498,057.21/986.22
  6. Step 6: Final answer
    x = 505.02

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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.