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Finding the Fourth Proportional to 20,392.48, 30,599.86 and 7,912.99

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Solution

The fourth proportional to 20,392.48, 30,599.86 and 7,912.99 is: 11,873.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.48 : 30,599.86 = 7,912.99 : x
  2. Step 2: Convert to fraction form
    20,392.48/30,599.86 = 7,912.99/x
  3. Step 3: Cross multiply
    20,392.48x = 30,599.86 × 7,912.99
  4. Step 4: Simplify right side
    20,392.48x = 242,136,386.18
  5. Step 5: Solve for x
    x = 242,136,386.18/20,392.48
  6. Step 6: Final answer
    x = 11,873.81

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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.