Home / 20,408.64-28,161.74-11,457.12

Finding the Fourth Proportional to 20,408.64, 28,161.74 and 11,457.12

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Solution

The fourth proportional to 20,408.64, 28,161.74 and 11,457.12 is: 15,809.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.64 : 28,161.74 = 11,457.12 : x
  2. Step 2: Convert to fraction form
    20,408.64/28,161.74 = 11,457.12/x
  3. Step 3: Cross multiply
    20,408.64x = 28,161.74 × 11,457.12
  4. Step 4: Simplify right side
    20,408.64x = 322,652,568.84
  5. Step 5: Solve for x
    x = 322,652,568.84/20,408.64
  6. Step 6: Final answer
    x = 15,809.61

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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.