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Finding the Fourth Proportional to 19,320.94, 28,978.99 and 6,172.22

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Solution

The fourth proportional to 19,320.94, 28,978.99 and 6,172.22 is: 9,257.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,320.94 : 28,978.99 = 6,172.22 : x
  2. Step 2: Convert to fraction form
    19,320.94/28,978.99 = 6,172.22/x
  3. Step 3: Cross multiply
    19,320.94x = 28,978.99 × 6,172.22
  4. Step 4: Simplify right side
    19,320.94x = 178,864,701.66
  5. Step 5: Solve for x
    x = 178,864,701.66/19,320.94
  6. Step 6: Final answer
    x = 9,257.56

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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.