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Finding the Fourth Proportional to 28,635.80, 42,954.78 and 7,860.92

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Solution

The fourth proportional to 28,635.80, 42,954.78 and 7,860.92 is: 11,791.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,635.80 : 42,954.78 = 7,860.92 : x
  2. Step 2: Convert to fraction form
    28,635.80/42,954.78 = 7,860.92/x
  3. Step 3: Cross multiply
    28,635.80x = 42,954.78 × 7,860.92
  4. Step 4: Simplify right side
    28,635.80x = 337,664,089.20
  5. Step 5: Solve for x
    x = 337,664,089.20/28,635.80
  6. Step 6: Final answer
    x = 11,791.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.