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Finding the Fourth Proportional to 986.49, 1,479.69 and 369.95

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Solution

The fourth proportional to 986.49, 1,479.69 and 369.95 is: 554.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.49 : 1,479.69 = 369.95 : x
  2. Step 2: Convert to fraction form
    986.49/1,479.69 = 369.95/x
  3. Step 3: Cross multiply
    986.49x = 1,479.69 × 369.95
  4. Step 4: Simplify right side
    986.49x = 547,403.92
  5. Step 5: Solve for x
    x = 547,403.92/986.49
  6. Step 6: Final answer
    x = 554.90

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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.