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Finding the Fourth Proportional to 12,879.93, 19,312.80 and 3,992.81

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Solution

The fourth proportional to 12,879.93, 19,312.80 and 3,992.81 is: 5,987.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.93 : 19,312.80 = 3,992.81 : x
  2. Step 2: Convert to fraction form
    12,879.93/19,312.80 = 3,992.81/x
  3. Step 3: Cross multiply
    12,879.93x = 19,312.80 × 3,992.81
  4. Step 4: Simplify right side
    12,879.93x = 77,112,244.40
  5. Step 5: Solve for x
    x = 77,112,244.40/12,879.93
  6. Step 6: Final answer
    x = 5,987.01

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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.