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Finding the Fourth Proportional to 19,172.98, 28,745.12 and 12,915.43

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Solution

The fourth proportional to 19,172.98, 28,745.12 and 12,915.43 is: 19,363.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,172.98 : 28,745.12 = 12,915.43 : x
  2. Step 2: Convert to fraction form
    19,172.98/28,745.12 = 12,915.43/x
  3. Step 3: Cross multiply
    19,172.98x = 28,745.12 × 12,915.43
  4. Step 4: Simplify right side
    19,172.98x = 371,255,545.63
  5. Step 5: Solve for x
    x = 371,255,545.63/19,172.98
  6. Step 6: Final answer
    x = 19,363.48

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1.5x scale

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.