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Finding the Fourth Proportional to 28,081.49, 42,128.30 and 8,361.63

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Solution

The fourth proportional to 28,081.49, 42,128.30 and 8,361.63 is: 12,544.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,081.49 : 42,128.30 = 8,361.63 : x
  2. Step 2: Convert to fraction form
    28,081.49/42,128.30 = 8,361.63/x
  3. Step 3: Cross multiply
    28,081.49x = 42,128.30 × 8,361.63
  4. Step 4: Simplify right side
    28,081.49x = 352,261,278.03
  5. Step 5: Solve for x
    x = 352,261,278.03/28,081.49
  6. Step 6: Final answer
    x = 12,544.25

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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.