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Finding the Fourth Proportional to 1,684.63, 2,324.99 and 986

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Solution

The fourth proportional to 1,684.63, 2,324.99 and 986 is: 1,360.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,684.63 : 2,324.99 = 986 : x
  2. Step 2: Convert to fraction form
    1,684.63/2,324.99 = 986/x
  3. Step 3: Cross multiply
    1,684.63x = 2,324.99 × 986
  4. Step 4: Simplify right side
    1,684.63x = 2,292,435.21
  5. Step 5: Solve for x
    x = 2,292,435.21/1,684.63
  6. Step 6: Final answer
    x = 1,360.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.