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Finding the Fourth Proportional to 28,922, 39,912.42 and 15,674

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Solution

The fourth proportional to 28,922, 39,912.42 and 15,674 is: 21,630.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,922 : 39,912.42 = 15,674 : x
  2. Step 2: Convert to fraction form
    28,922/39,912.42 = 15,674/x
  3. Step 3: Cross multiply
    28,922x = 39,912.42 × 15,674
  4. Step 4: Simplify right side
    28,922x = 625,587,271.08
  5. Step 5: Solve for x
    x = 625,587,271.08/28,922
  6. Step 6: Final answer
    x = 21,630.15

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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.