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Finding the Fourth Proportional to 28,640.49, 42,939.14 and 18,782.25

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Solution

The fourth proportional to 28,640.49, 42,939.14 and 18,782.25 is: 28,159.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,640.49 : 42,939.14 = 18,782.25 : x
  2. Step 2: Convert to fraction form
    28,640.49/42,939.14 = 18,782.25/x
  3. Step 3: Cross multiply
    28,640.49x = 42,939.14 × 18,782.25
  4. Step 4: Simplify right side
    28,640.49x = 806,493,568.35
  5. Step 5: Solve for x
    x = 806,493,568.35/28,640.49
  6. Step 6: Final answer
    x = 28,159.21

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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.