Home / 21,130.86-31,660.65-13,724.22

Finding the Fourth Proportional to 21,130.86, 31,660.65 and 13,724.22

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Solution

The fourth proportional to 21,130.86, 31,660.65 and 13,724.22 is: 20,563.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,130.86 : 31,660.65 = 13,724.22 : x
  2. Step 2: Convert to fraction form
    21,130.86/31,660.65 = 13,724.22/x
  3. Step 3: Cross multiply
    21,130.86x = 31,660.65 × 13,724.22
  4. Step 4: Simplify right side
    21,130.86x = 434,517,725.94
  5. Step 5: Solve for x
    x = 434,517,725.94/21,130.86
  6. Step 6: Final answer
    x = 20,563.18

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1.5x scale

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.