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Finding the Fourth Proportional to 28,915.56, 43,373.28 and 8,139

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Solution

The fourth proportional to 28,915.56, 43,373.28 and 8,139 is: 12,208.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,915.56 : 43,373.28 = 8,139 : x
  2. Step 2: Convert to fraction form
    28,915.56/43,373.28 = 8,139/x
  3. Step 3: Cross multiply
    28,915.56x = 43,373.28 × 8,139
  4. Step 4: Simplify right side
    28,915.56x = 353,015,125.92
  5. Step 5: Solve for x
    x = 353,015,125.92/28,915.56
  6. Step 6: Final answer
    x = 12,208.48

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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.