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Finding the Fourth Proportional to 12,613.60, 18,927.60 and 8,720.80

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Solution

The fourth proportional to 12,613.60, 18,927.60 and 8,720.80 is: 13,086.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,613.60 : 18,927.60 = 8,720.80 : x
  2. Step 2: Convert to fraction form
    12,613.60/18,927.60 = 8,720.80/x
  3. Step 3: Cross multiply
    12,613.60x = 18,927.60 × 8,720.80
  4. Step 4: Simplify right side
    12,613.60x = 165,063,814.08
  5. Step 5: Solve for x
    x = 165,063,814.08/12,613.60
  6. Step 6: Final answer
    x = 13,086.18

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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.