Home / 21,741.36-30,003.78-12,309.72

Finding the Fourth Proportional to 21,741.36, 30,003.78 and 12,309.72

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Solution

The fourth proportional to 21,741.36, 30,003.78 and 12,309.72 is: 16,987.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,741.36 : 30,003.78 = 12,309.72 : x
  2. Step 2: Convert to fraction form
    21,741.36/30,003.78 = 12,309.72/x
  3. Step 3: Cross multiply
    21,741.36x = 30,003.78 × 12,309.72
  4. Step 4: Simplify right side
    21,741.36x = 369,338,130.74
  5. Step 5: Solve for x
    x = 369,338,130.74/21,741.36
  6. Step 6: Final answer
    x = 16,987.81

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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.