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Finding the Fourth Proportional to 28,712.40, 43,049.89 and 9,991

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Solution

The fourth proportional to 28,712.40, 43,049.89 and 9,991 is: 14,979.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,712.40 : 43,049.89 = 9,991 : x
  2. Step 2: Convert to fraction form
    28,712.40/43,049.89 = 9,991/x
  3. Step 3: Cross multiply
    28,712.40x = 43,049.89 × 9,991
  4. Step 4: Simplify right side
    28,712.40x = 430,111,450.99
  5. Step 5: Solve for x
    x = 430,111,450.99/28,712.40
  6. Step 6: Final answer
    x = 14,979.99

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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.