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Finding the Fourth Proportional to 986.12, 1,479.38 and 369.81

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Solution

The fourth proportional to 986.12, 1,479.38 and 369.81 is: 554.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.12 : 1,479.38 = 369.81 : x
  2. Step 2: Convert to fraction form
    986.12/1,479.38 = 369.81/x
  3. Step 3: Cross multiply
    986.12x = 1,479.38 × 369.81
  4. Step 4: Simplify right side
    986.12x = 547,089.52
  5. Step 5: Solve for x
    x = 547,089.52/986.12
  6. Step 6: Final answer
    x = 554.79

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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.