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Finding the Fourth Proportional to 986.10, 1,479.36 and 292.77

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Solution

The fourth proportional to 986.10, 1,479.36 and 292.77 is: 439.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.10 : 1,479.36 = 292.77 : x
  2. Step 2: Convert to fraction form
    986.10/1,479.36 = 292.77/x
  3. Step 3: Cross multiply
    986.10x = 1,479.36 × 292.77
  4. Step 4: Simplify right side
    986.10x = 433,112.23
  5. Step 5: Solve for x
    x = 433,112.23/986.10
  6. Step 6: Final answer
    x = 439.22

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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.