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Finding the Fourth Proportional to 986.13, 1,479.20 and 336.78

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Solution

The fourth proportional to 986.13, 1,479.20 and 336.78 is: 505.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.13 : 1,479.20 = 336.78 : x
  2. Step 2: Convert to fraction form
    986.13/1,479.20 = 336.78/x
  3. Step 3: Cross multiply
    986.13x = 1,479.20 × 336.78
  4. Step 4: Simplify right side
    986.13x = 498,163.29
  5. Step 5: Solve for x
    x = 498,163.29/986.13
  6. Step 6: Final answer
    x = 505.17

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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.