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Finding the Fourth Proportional to 8,128.90, 12,193.32 and 1,972.90

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Solution

The fourth proportional to 8,128.90, 12,193.32 and 1,972.90 is: 2,959.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.90 : 12,193.32 = 1,972.90 : x
  2. Step 2: Convert to fraction form
    8,128.90/12,193.32 = 1,972.90/x
  3. Step 3: Cross multiply
    8,128.90x = 12,193.32 × 1,972.90
  4. Step 4: Simplify right side
    8,128.90x = 24,056,201.03
  5. Step 5: Solve for x
    x = 24,056,201.03/8,128.90
  6. Step 6: Final answer
    x = 2,959.34

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Double scale
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1.5x scale

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.