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Finding the Fourth Proportional to 13,889.15, 20,838.95 and 8,270.07

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Solution

The fourth proportional to 13,889.15, 20,838.95 and 8,270.07 is: 12,408.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.15 : 20,838.95 = 8,270.07 : x
  2. Step 2: Convert to fraction form
    13,889.15/20,838.95 = 8,270.07/x
  3. Step 3: Cross multiply
    13,889.15x = 20,838.95 × 8,270.07
  4. Step 4: Simplify right side
    13,889.15x = 172,339,486.74
  5. Step 5: Solve for x
    x = 172,339,486.74/13,889.15
  6. Step 6: Final answer
    x = 12,408.21

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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.