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Finding the Fourth Proportional to 13,163.70, 19,745.55 and 12,645.30

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Solution

The fourth proportional to 13,163.70, 19,745.55 and 12,645.30 is: 18,967.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,163.70 : 19,745.55 = 12,645.30 : x
  2. Step 2: Convert to fraction form
    13,163.70/19,745.55 = 12,645.30/x
  3. Step 3: Cross multiply
    13,163.70x = 19,745.55 × 12,645.30
  4. Step 4: Simplify right side
    13,163.70x = 249,688,403.42
  5. Step 5: Solve for x
    x = 249,688,403.42/13,163.70
  6. Step 6: Final answer
    x = 18,967.95

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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.