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Finding the Fourth Proportional to 28,361.88, 42,542.91 and 8,640.36

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Solution

The fourth proportional to 28,361.88, 42,542.91 and 8,640.36 is: 12,960.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.88 : 42,542.91 = 8,640.36 : x
  2. Step 2: Convert to fraction form
    28,361.88/42,542.91 = 8,640.36/x
  3. Step 3: Cross multiply
    28,361.88x = 42,542.91 × 8,640.36
  4. Step 4: Simplify right side
    28,361.88x = 367,586,057.85
  5. Step 5: Solve for x
    x = 367,586,057.85/28,361.88
  6. Step 6: Final answer
    x = 12,960.57

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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.