Home / 20,840.36-28,760.10-11,408.72

Finding the Fourth Proportional to 20,840.36, 28,760.10 and 11,408.72

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Solution

The fourth proportional to 20,840.36, 28,760.10 and 11,408.72 is: 15,744.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.36 : 28,760.10 = 11,408.72 : x
  2. Step 2: Convert to fraction form
    20,840.36/28,760.10 = 11,408.72/x
  3. Step 3: Cross multiply
    20,840.36x = 28,760.10 × 11,408.72
  4. Step 4: Simplify right side
    20,840.36x = 328,115,928.07
  5. Step 5: Solve for x
    x = 328,115,928.07/20,840.36
  6. Step 6: Final answer
    x = 15,744.25

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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.