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Finding the Fourth Proportional to 19,172.72, 28,761.72 and 8,641.28

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Solution

The fourth proportional to 19,172.72, 28,761.72 and 8,641.28 is: 12,963.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,172.72 : 28,761.72 = 8,641.28 : x
  2. Step 2: Convert to fraction form
    19,172.72/28,761.72 = 8,641.28/x
  3. Step 3: Cross multiply
    19,172.72x = 28,761.72 × 8,641.28
  4. Step 4: Simplify right side
    19,172.72x = 248,538,075.80
  5. Step 5: Solve for x
    x = 248,538,075.80/19,172.72
  6. Step 6: Final answer
    x = 12,963.11

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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.