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Finding the Fourth Proportional to 3,618.32, 5,427.82 and 986

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Solution

The fourth proportional to 3,618.32, 5,427.82 and 986 is: 1,479.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.32 : 5,427.82 = 986 : x
  2. Step 2: Convert to fraction form
    3,618.32/5,427.82 = 986/x
  3. Step 3: Cross multiply
    3,618.32x = 5,427.82 × 986
  4. Step 4: Simplify right side
    3,618.32x = 5,351,830.52
  5. Step 5: Solve for x
    x = 5,351,830.52/3,618.32
  6. Step 6: Final answer
    x = 1,479.09

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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.