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Finding the Fourth Proportional to 28,239.88, 38,975.70 and 15,668.68

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Solution

The fourth proportional to 28,239.88, 38,975.70 and 15,668.68 is: 21,625.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,239.88 : 38,975.70 = 15,668.68 : x
  2. Step 2: Convert to fraction form
    28,239.88/38,975.70 = 15,668.68/x
  3. Step 3: Cross multiply
    28,239.88x = 38,975.70 × 15,668.68
  4. Step 4: Simplify right side
    28,239.88x = 610,697,771.08
  5. Step 5: Solve for x
    x = 610,697,771.08/28,239.88
  6. Step 6: Final answer
    x = 21,625.37

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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.