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Finding the Fourth Proportional to 12,720.99, 19,081.29 and 3,103.90

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Solution

The fourth proportional to 12,720.99, 19,081.29 and 3,103.90 is: 4,655.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.99 : 19,081.29 = 3,103.90 : x
  2. Step 2: Convert to fraction form
    12,720.99/19,081.29 = 3,103.90/x
  3. Step 3: Cross multiply
    12,720.99x = 19,081.29 × 3,103.90
  4. Step 4: Simplify right side
    12,720.99x = 59,226,416.03
  5. Step 5: Solve for x
    x = 59,226,416.03/12,720.99
  6. Step 6: Final answer
    x = 4,655.80

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Double scale
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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.