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Finding the Fourth Proportional to 13,788.68, 20,675.21 and 12,613.16

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Solution

The fourth proportional to 13,788.68, 20,675.21 and 12,613.16 is: 18,912.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,788.68 : 20,675.21 = 12,613.16 : x
  2. Step 2: Convert to fraction form
    13,788.68/20,675.21 = 12,613.16/x
  3. Step 3: Cross multiply
    13,788.68x = 20,675.21 × 12,613.16
  4. Step 4: Simplify right side
    13,788.68x = 260,779,720.39
  5. Step 5: Solve for x
    x = 260,779,720.39/13,788.68
  6. Step 6: Final answer
    x = 18,912.60

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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.