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Finding the Fourth Proportional to 7,992.90, 11,990.39 and 4,290.03

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Solution

The fourth proportional to 7,992.90, 11,990.39 and 4,290.03 is: 6,435.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,992.90 : 11,990.39 = 4,290.03 : x
  2. Step 2: Convert to fraction form
    7,992.90/11,990.39 = 4,290.03/x
  3. Step 3: Cross multiply
    7,992.90x = 11,990.39 × 4,290.03
  4. Step 4: Simplify right side
    7,992.90x = 51,439,111.36
  5. Step 5: Solve for x
    x = 51,439,111.36/7,992.90
  6. Step 6: Final answer
    x = 6,435.60

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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.