Home / 31,689.47-43,724.07-21,638.84

Finding the Fourth Proportional to 31,689.47, 43,724.07 and 21,638.84

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Solution

The fourth proportional to 31,689.47, 43,724.07 and 21,638.84 is: 29,856.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,689.47 : 43,724.07 = 21,638.84 : x
  2. Step 2: Convert to fraction form
    31,689.47/43,724.07 = 21,638.84/x
  3. Step 3: Cross multiply
    31,689.47x = 43,724.07 × 21,638.84
  4. Step 4: Simplify right side
    31,689.47x = 946,137,936.26
  5. Step 5: Solve for x
    x = 946,137,936.26/31,689.47
  6. Step 6: Final answer
    x = 29,856.54

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1.5x scale

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.