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Finding the Fourth Proportional to 21,990.51, 30,351.51 and 14,919.21

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Solution

The fourth proportional to 21,990.51, 30,351.51 and 14,919.21 is: 20,591.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.51 : 30,351.51 = 14,919.21 : x
  2. Step 2: Convert to fraction form
    21,990.51/30,351.51 = 14,919.21/x
  3. Step 3: Cross multiply
    21,990.51x = 30,351.51 × 14,919.21
  4. Step 4: Simplify right side
    21,990.51x = 452,820,551.51
  5. Step 5: Solve for x
    x = 452,820,551.51/21,990.51
  6. Step 6: Final answer
    x = 20,591.63

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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.