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Finding the Fourth Proportional to 28,238.54, 38,958.10 and 19,738.40

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Solution

The fourth proportional to 28,238.54, 38,958.10 and 19,738.40 is: 27,231.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,238.54 : 38,958.10 = 19,738.40 : x
  2. Step 2: Convert to fraction form
    28,238.54/38,958.10 = 19,738.40/x
  3. Step 3: Cross multiply
    28,238.54x = 38,958.10 × 19,738.40
  4. Step 4: Simplify right side
    28,238.54x = 768,970,316.90
  5. Step 5: Solve for x
    x = 768,970,316.90/28,238.54
  6. Step 6: Final answer
    x = 27,231.24

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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.