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Finding the Fourth Proportional to 7,883.70, 11,809.35 and 3,990.30

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Solution

The fourth proportional to 7,883.70, 11,809.35 and 3,990.30 is: 5,977.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,883.70 : 11,809.35 = 3,990.30 : x
  2. Step 2: Convert to fraction form
    7,883.70/11,809.35 = 3,990.30/x
  3. Step 3: Cross multiply
    7,883.70x = 11,809.35 × 3,990.30
  4. Step 4: Simplify right side
    7,883.70x = 47,122,849.31
  5. Step 5: Solve for x
    x = 47,122,849.31/7,883.70
  6. Step 6: Final answer
    x = 5,977.25

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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.