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Finding the Fourth Proportional to 28,187.92, 38,890.56 and 18,758.08

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Solution

The fourth proportional to 28,187.92, 38,890.56 and 18,758.08 is: 25,880.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,187.92 : 38,890.56 = 18,758.08 : x
  2. Step 2: Convert to fraction form
    28,187.92/38,890.56 = 18,758.08/x
  3. Step 3: Cross multiply
    28,187.92x = 38,890.56 × 18,758.08
  4. Step 4: Simplify right side
    28,187.92x = 729,512,235.72
  5. Step 5: Solve for x
    x = 729,512,235.72/28,187.92
  6. Step 6: Final answer
    x = 25,880.31

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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.