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Finding the Fourth Proportional to 28,812.74, 39,771.42 and 16,879.88

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Solution

The fourth proportional to 28,812.74, 39,771.42 and 16,879.88 is: 23,300.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,812.74 : 39,771.42 = 16,879.88 : x
  2. Step 2: Convert to fraction form
    28,812.74/39,771.42 = 16,879.88/x
  3. Step 3: Cross multiply
    28,812.74x = 39,771.42 × 16,879.88
  4. Step 4: Simplify right side
    28,812.74x = 671,336,797.03
  5. Step 5: Solve for x
    x = 671,336,797.03/28,812.74
  6. Step 6: Final answer
    x = 23,300.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.