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Finding the Fourth Proportional to 28,636.88, 42,956.12 and 7,860.38

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Solution

The fourth proportional to 28,636.88, 42,956.12 and 7,860.38 is: 11,790.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.88 : 42,956.12 = 7,860.38 : x
  2. Step 2: Convert to fraction form
    28,636.88/42,956.12 = 7,860.38/x
  3. Step 3: Cross multiply
    28,636.88x = 42,956.12 × 7,860.38
  4. Step 4: Simplify right side
    28,636.88x = 337,651,231.40
  5. Step 5: Solve for x
    x = 337,651,231.40/28,636.88
  6. Step 6: Final answer
    x = 11,790.78

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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.