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Finding the Fourth Proportional to 28,207.92, 38,918.16 and 18,778.08

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Solution

The fourth proportional to 28,207.92, 38,918.16 and 18,778.08 is: 25,907.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,207.92 : 38,918.16 = 18,778.08 : x
  2. Step 2: Convert to fraction form
    28,207.92/38,918.16 = 18,778.08/x
  3. Step 3: Cross multiply
    28,207.92x = 38,918.16 × 18,778.08
  4. Step 4: Simplify right side
    28,207.92x = 730,808,321.93
  5. Step 5: Solve for x
    x = 730,808,321.93/28,207.92
  6. Step 6: Final answer
    x = 25,907.91

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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.