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Finding the Fourth Proportional to 20,812.51, 28,722.04 and 11,859.78

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Solution

The fourth proportional to 20,812.51, 28,722.04 and 11,859.78 is: 16,366.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.51 : 28,722.04 = 11,859.78 : x
  2. Step 2: Convert to fraction form
    20,812.51/28,722.04 = 11,859.78/x
  3. Step 3: Cross multiply
    20,812.51x = 28,722.04 × 11,859.78
  4. Step 4: Simplify right side
    20,812.51x = 340,637,220.32
  5. Step 5: Solve for x
    x = 340,637,220.32/20,812.51
  6. Step 6: Final answer
    x = 16,366.94

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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.