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Finding the Fourth Proportional to 28,908.12, 39,893.94 and 16,971.96

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Solution

The fourth proportional to 28,908.12, 39,893.94 and 16,971.96 is: 23,421.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,908.12 : 39,893.94 = 16,971.96 : x
  2. Step 2: Convert to fraction form
    28,908.12/39,893.94 = 16,971.96/x
  3. Step 3: Cross multiply
    28,908.12x = 39,893.94 × 16,971.96
  4. Step 4: Simplify right side
    28,908.12x = 677,078,353.92
  5. Step 5: Solve for x
    x = 677,078,353.92/28,908.12
  6. Step 6: Final answer
    x = 23,421.74

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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.