Home / 7,989.21-11,983.55-2,145.51

Finding the Fourth Proportional to 7,989.21, 11,983.55 and 2,145.51

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Solution

The fourth proportional to 7,989.21, 11,983.55 and 2,145.51 is: 3,218.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.21 : 11,983.55 = 2,145.51 : x
  2. Step 2: Convert to fraction form
    7,989.21/11,983.55 = 2,145.51/x
  3. Step 3: Cross multiply
    7,989.21x = 11,983.55 × 2,145.51
  4. Step 4: Simplify right side
    7,989.21x = 25,710,815.63
  5. Step 5: Solve for x
    x = 25,710,815.63/7,989.21
  6. Step 6: Final answer
    x = 3,218.19

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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.