Home / 21,786.85-30,052.78-13,388.77

Finding the Fourth Proportional to 21,786.85, 30,052.78 and 13,388.77

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Solution

The fourth proportional to 21,786.85, 30,052.78 and 13,388.77 is: 18,468.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,786.85 : 30,052.78 = 13,388.77 : x
  2. Step 2: Convert to fraction form
    21,786.85/30,052.78 = 13,388.77/x
  3. Step 3: Cross multiply
    21,786.85x = 30,052.78 × 13,388.77
  4. Step 4: Simplify right side
    21,786.85x = 402,369,759.28
  5. Step 5: Solve for x
    x = 402,369,759.28/21,786.85
  6. Step 6: Final answer
    x = 18,468.47

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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.