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Finding the Fourth Proportional to 28,608.78, 39,479.40 and 17,287.68

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Solution

The fourth proportional to 28,608.78, 39,479.40 and 17,287.68 is: 23,856.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,608.78 : 39,479.40 = 17,287.68 : x
  2. Step 2: Convert to fraction form
    28,608.78/39,479.40 = 17,287.68/x
  3. Step 3: Cross multiply
    28,608.78x = 39,479.40 × 17,287.68
  4. Step 4: Simplify right side
    28,608.78x = 682,507,233.79
  5. Step 5: Solve for x
    x = 682,507,233.79/28,608.78
  6. Step 6: Final answer
    x = 23,856.57

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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.