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Finding the Fourth Proportional to 28,691.72, 43,040.06 and 7,915.22

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Solution

The fourth proportional to 28,691.72, 43,040.06 and 7,915.22 is: 11,873.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,691.72 : 43,040.06 = 7,915.22 : x
  2. Step 2: Convert to fraction form
    28,691.72/43,040.06 = 7,915.22/x
  3. Step 3: Cross multiply
    28,691.72x = 43,040.06 × 7,915.22
  4. Step 4: Simplify right side
    28,691.72x = 340,671,480.02
  5. Step 5: Solve for x
    x = 340,671,480.02/28,691.72
  6. Step 6: Final answer
    x = 11,873.51

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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.