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Finding the Fourth Proportional to 986.36, 1,479.20 and 292.86

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Solution

The fourth proportional to 986.36, 1,479.20 and 292.86 is: 439.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.36 : 1,479.20 = 292.86 : x
  2. Step 2: Convert to fraction form
    986.36/1,479.20 = 292.86/x
  3. Step 3: Cross multiply
    986.36x = 1,479.20 × 292.86
  4. Step 4: Simplify right side
    986.36x = 433,198.51
  5. Step 5: Solve for x
    x = 433,198.51/986.36
  6. Step 6: Final answer
    x = 439.19

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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.