Home / 20,840.54-28,758.83-11,407.28

Finding the Fourth Proportional to 20,840.54, 28,758.83 and 11,407.28

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Solution

The fourth proportional to 20,840.54, 28,758.83 and 11,407.28 is: 15,741.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.54 : 28,758.83 = 11,407.28 : x
  2. Step 2: Convert to fraction form
    20,840.54/28,758.83 = 11,407.28/x
  3. Step 3: Cross multiply
    20,840.54x = 28,758.83 × 11,407.28
  4. Step 4: Simplify right side
    20,840.54x = 328,059,825.45
  5. Step 5: Solve for x
    x = 328,059,825.45/20,840.54
  6. Step 6: Final answer
    x = 15,741.43

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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.