Home / 21,135.23-29,153.42-13,591.40

Finding the Fourth Proportional to 21,135.23, 29,153.42 and 13,591.40

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Solution

The fourth proportional to 21,135.23, 29,153.42 and 13,591.40 is: 18,747.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.23 : 29,153.42 = 13,591.40 : x
  2. Step 2: Convert to fraction form
    21,135.23/29,153.42 = 13,591.40/x
  3. Step 3: Cross multiply
    21,135.23x = 29,153.42 × 13,591.40
  4. Step 4: Simplify right side
    21,135.23x = 396,235,629.83
  5. Step 5: Solve for x
    x = 396,235,629.83/21,135.23
  6. Step 6: Final answer
    x = 18,747.64

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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.