Home / 21,380.40-31,984.20-18,490.80

Finding the Fourth Proportional to 21,380.40, 31,984.20 and 18,490.80

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Solution

The fourth proportional to 21,380.40, 31,984.20 and 18,490.80 is: 27,661.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,380.40 : 31,984.20 = 18,490.80 : x
  2. Step 2: Convert to fraction form
    21,380.40/31,984.20 = 18,490.80/x
  3. Step 3: Cross multiply
    21,380.40x = 31,984.20 × 18,490.80
  4. Step 4: Simplify right side
    21,380.40x = 591,413,445.36
  5. Step 5: Solve for x
    x = 591,413,445.36/21,380.40
  6. Step 6: Final answer
    x = 27,661.48

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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.