Home / 20,408.81-28,164.46-11,457.15

Finding the Fourth Proportional to 20,408.81, 28,164.46 and 11,457.15

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Solution

The fourth proportional to 20,408.81, 28,164.46 and 11,457.15 is: 15,811.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.81 : 28,164.46 = 11,457.15 : x
  2. Step 2: Convert to fraction form
    20,408.81/28,164.46 = 11,457.15/x
  3. Step 3: Cross multiply
    20,408.81x = 28,164.46 × 11,457.15
  4. Step 4: Simplify right side
    20,408.81x = 322,684,330.11
  5. Step 5: Solve for x
    x = 322,684,330.11/20,408.81
  6. Step 6: Final answer
    x = 15,811.03

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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.