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Finding the Fourth Proportional to 28,747.12, 43,120.80 and 7,969.12

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Solution

The fourth proportional to 28,747.12, 43,120.80 and 7,969.12 is: 11,953.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,747.12 : 43,120.80 = 7,969.12 : x
  2. Step 2: Convert to fraction form
    28,747.12/43,120.80 = 7,969.12/x
  3. Step 3: Cross multiply
    28,747.12x = 43,120.80 × 7,969.12
  4. Step 4: Simplify right side
    28,747.12x = 343,634,829.70
  5. Step 5: Solve for x
    x = 343,634,829.70/28,747.12
  6. Step 6: Final answer
    x = 11,953.71

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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.