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Finding the Fourth Proportional to 28,906.78, 39,891.36 and 15,658.78

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Solution

The fourth proportional to 28,906.78, 39,891.36 and 15,658.78 is: 21,609.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,906.78 : 39,891.36 = 15,658.78 : x
  2. Step 2: Convert to fraction form
    28,906.78/39,891.36 = 15,658.78/x
  3. Step 3: Cross multiply
    28,906.78x = 39,891.36 × 15,658.78
  4. Step 4: Simplify right side
    28,906.78x = 624,650,030.14
  5. Step 5: Solve for x
    x = 624,650,030.14/28,906.78
  6. Step 6: Final answer
    x = 21,609.12

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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.