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Finding the Fourth Proportional to 19,679.76, 29,522.52 and 7,990.56

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Solution

The fourth proportional to 19,679.76, 29,522.52 and 7,990.56 is: 11,987.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,679.76 : 29,522.52 = 7,990.56 : x
  2. Step 2: Convert to fraction form
    19,679.76/29,522.52 = 7,990.56/x
  3. Step 3: Cross multiply
    19,679.76x = 29,522.52 × 7,990.56
  4. Step 4: Simplify right side
    19,679.76x = 235,901,467.41
  5. Step 5: Solve for x
    x = 235,901,467.41/19,679.76
  6. Step 6: Final answer
    x = 11,987.01

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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.