Home / 21,133.99-31,698.55-7,987.69

Finding the Fourth Proportional to 21,133.99, 31,698.55 and 7,987.69

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Solution

The fourth proportional to 21,133.99, 31,698.55 and 7,987.69 is: 11,980.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,133.99 : 31,698.55 = 7,987.69 : x
  2. Step 2: Convert to fraction form
    21,133.99/31,698.55 = 7,987.69/x
  3. Step 3: Cross multiply
    21,133.99x = 31,698.55 × 7,987.69
  4. Step 4: Simplify right side
    21,133.99x = 253,198,190.85
  5. Step 5: Solve for x
    x = 253,198,190.85/21,133.99
  6. Step 6: Final answer
    x = 11,980.61

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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.