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Finding the Fourth Proportional to 20,840.48, 28,760.48 and 12,883.04

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Solution

The fourth proportional to 20,840.48, 28,760.48 and 12,883.04 is: 17,778.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.48 : 28,760.48 = 12,883.04 : x
  2. Step 2: Convert to fraction form
    20,840.48/28,760.48 = 12,883.04/x
  3. Step 3: Cross multiply
    20,840.48x = 28,760.48 × 12,883.04
  4. Step 4: Simplify right side
    20,840.48x = 370,522,414.26
  5. Step 5: Solve for x
    x = 370,522,414.26/20,840.48
  6. Step 6: Final answer
    x = 17,778.98

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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.