Home / 21,187.31-29,235.43-13,643.87

Finding the Fourth Proportional to 21,187.31, 29,235.43 and 13,643.87

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Solution

The fourth proportional to 21,187.31, 29,235.43 and 13,643.87 is: 18,826.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.31 : 29,235.43 = 13,643.87 : x
  2. Step 2: Convert to fraction form
    21,187.31/29,235.43 = 13,643.87/x
  3. Step 3: Cross multiply
    21,187.31x = 29,235.43 × 13,643.87
  4. Step 4: Simplify right side
    21,187.31x = 398,884,406.31
  5. Step 5: Solve for x
    x = 398,884,406.31/21,187.31
  6. Step 6: Final answer
    x = 18,826.57

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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.