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Finding the Fourth Proportional to 8,101.80, 12,128.40 and 4,813.20

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Solution

The fourth proportional to 8,101.80, 12,128.40 and 4,813.20 is: 7,205.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,101.80 : 12,128.40 = 4,813.20 : x
  2. Step 2: Convert to fraction form
    8,101.80/12,128.40 = 4,813.20/x
  3. Step 3: Cross multiply
    8,101.80x = 12,128.40 × 4,813.20
  4. Step 4: Simplify right side
    8,101.80x = 58,376,414.88
  5. Step 5: Solve for x
    x = 58,376,414.88/8,101.80
  6. Step 6: Final answer
    x = 7,205.36

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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.