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Finding the Fourth Proportional to 13,890.34, 20,909.90 and 12,461.50

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Solution

The fourth proportional to 13,890.34, 20,909.90 and 12,461.50 is: 18,758.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.34 : 20,909.90 = 12,461.50 : x
  2. Step 2: Convert to fraction form
    13,890.34/20,909.90 = 12,461.50/x
  3. Step 3: Cross multiply
    13,890.34x = 20,909.90 × 12,461.50
  4. Step 4: Simplify right side
    13,890.34x = 260,568,718.85
  5. Step 5: Solve for x
    x = 260,568,718.85/13,890.34
  6. Step 6: Final answer
    x = 18,758.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.