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Finding the Fourth Proportional to 21,039.55, 31,550.04 and 7,882.68

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Solution

The fourth proportional to 21,039.55, 31,550.04 and 7,882.68 is: 11,820.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.55 : 31,550.04 = 7,882.68 : x
  2. Step 2: Convert to fraction form
    21,039.55/31,550.04 = 7,882.68/x
  3. Step 3: Cross multiply
    21,039.55x = 31,550.04 × 7,882.68
  4. Step 4: Simplify right side
    21,039.55x = 248,698,987.62
  5. Step 5: Solve for x
    x = 248,698,987.62/21,039.55
  6. Step 6: Final answer
    x = 11,820.55

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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.