Home / 21,845.36-30,139.28-12,768.56

Finding the Fourth Proportional to 21,845.36, 30,139.28 and 12,768.56

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Solution

The fourth proportional to 21,845.36, 30,139.28 and 12,768.56 is: 17,616.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,845.36 : 30,139.28 = 12,768.56 : x
  2. Step 2: Convert to fraction form
    21,845.36/30,139.28 = 12,768.56/x
  3. Step 3: Cross multiply
    21,845.36x = 30,139.28 × 12,768.56
  4. Step 4: Simplify right side
    21,845.36x = 384,835,205.04
  5. Step 5: Solve for x
    x = 384,835,205.04/21,845.36
  6. Step 6: Final answer
    x = 17,616.34

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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.