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Finding the Fourth Proportional to 5,619, 8,428.50 and 1,515

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Solution

The fourth proportional to 5,619, 8,428.50 and 1,515 is: 2,272.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,619 : 8,428.50 = 1,515 : x
  2. Step 2: Convert to fraction form
    5,619/8,428.50 = 1,515/x
  3. Step 3: Cross multiply
    5,619x = 8,428.50 × 1,515
  4. Step 4: Simplify right side
    5,619x = 12,769,177.50
  5. Step 5: Solve for x
    x = 12,769,177.50/5,619
  6. Step 6: Final answer
    x = 2,272.50

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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.