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Finding the Fourth Proportional to 986.09, 1,478.22 and 370.20

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Solution

The fourth proportional to 986.09, 1,478.22 and 370.20 is: 554.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.09 : 1,478.22 = 370.20 : x
  2. Step 2: Convert to fraction form
    986.09/1,478.22 = 370.20/x
  3. Step 3: Cross multiply
    986.09x = 1,478.22 × 370.20
  4. Step 4: Simplify right side
    986.09x = 547,234.97
  5. Step 5: Solve for x
    x = 547,234.97/986.09
  6. Step 6: Final answer
    x = 554.95

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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.