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Finding the Fourth Proportional to 1,081.96, 1,621.86 and 986.92

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Solution

The fourth proportional to 1,081.96, 1,621.86 and 986.92 is: 1,479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.96 : 1,621.86 = 986.92 : x
  2. Step 2: Convert to fraction form
    1,081.96/1,621.86 = 986.92/x
  3. Step 3: Cross multiply
    1,081.96x = 1,621.86 × 986.92
  4. Step 4: Simplify right side
    1,081.96x = 1,600,646.07
  5. Step 5: Solve for x
    x = 1,600,646.07/1,081.96
  6. Step 6: Final answer
    x = 1,479.39

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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.