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Finding the Fourth Proportional to 21,991.75, 30,349.70 and 12,055.75

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Solution

The fourth proportional to 21,991.75, 30,349.70 and 12,055.75 is: 16,637.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.75 : 30,349.70 = 12,055.75 : x
  2. Step 2: Convert to fraction form
    21,991.75/30,349.70 = 12,055.75/x
  3. Step 3: Cross multiply
    21,991.75x = 30,349.70 × 12,055.75
  4. Step 4: Simplify right side
    21,991.75x = 365,888,395.78
  5. Step 5: Solve for x
    x = 365,888,395.78/21,991.75
  6. Step 6: Final answer
    x = 16,637.53

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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.