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Finding the Fourth Proportional to 28,908.96, 39,880.08 and 19,965.60

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Solution

The fourth proportional to 28,908.96, 39,880.08 and 19,965.60 is: 27,542.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,908.96 : 39,880.08 = 19,965.60 : x
  2. Step 2: Convert to fraction form
    28,908.96/39,880.08 = 19,965.60/x
  3. Step 3: Cross multiply
    28,908.96x = 39,880.08 × 19,965.60
  4. Step 4: Simplify right side
    28,908.96x = 796,229,725.25
  5. Step 5: Solve for x
    x = 796,229,725.25/28,908.96
  6. Step 6: Final answer
    x = 27,542.66

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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.