Home / 7,987.32-11,979.90-2,143.98

Finding the Fourth Proportional to 7,987.32, 11,979.90 and 2,143.98

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Solution

The fourth proportional to 7,987.32, 11,979.90 and 2,143.98 is: 3,215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.32 : 11,979.90 = 2,143.98 : x
  2. Step 2: Convert to fraction form
    7,987.32/11,979.90 = 2,143.98/x
  3. Step 3: Cross multiply
    7,987.32x = 11,979.90 × 2,143.98
  4. Step 4: Simplify right side
    7,987.32x = 25,684,666.00
  5. Step 5: Solve for x
    x = 25,684,666.00/7,987.32
  6. Step 6: Final answer
    x = 3,215.68

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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.