Home / 21,187.74-31,781.82-5,392.80

Finding the Fourth Proportional to 21,187.74, 31,781.82 and 5,392.80

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Solution

The fourth proportional to 21,187.74, 31,781.82 and 5,392.80 is: 8,089.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.74 : 31,781.82 = 5,392.80 : x
  2. Step 2: Convert to fraction form
    21,187.74/31,781.82 = 5,392.80/x
  3. Step 3: Cross multiply
    21,187.74x = 31,781.82 × 5,392.80
  4. Step 4: Simplify right side
    21,187.74x = 171,392,998.90
  5. Step 5: Solve for x
    x = 171,392,998.90/21,187.74
  6. Step 6: Final answer
    x = 8,089.25

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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.