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Finding the Fourth Proportional to 19,772.64, 29,659.08 and 8,085.86

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Solution

The fourth proportional to 19,772.64, 29,659.08 and 8,085.86 is: 12,128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,772.64 : 29,659.08 = 8,085.86 : x
  2. Step 2: Convert to fraction form
    19,772.64/29,659.08 = 8,085.86/x
  3. Step 3: Cross multiply
    19,772.64x = 29,659.08 × 8,085.86
  4. Step 4: Simplify right side
    19,772.64x = 239,819,258.55
  5. Step 5: Solve for x
    x = 239,819,258.55/19,772.64
  6. Step 6: Final answer
    x = 12,128.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.