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Finding the Fourth Proportional to 19,921.95, 29,885.09 and 7,447.95

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Solution

The fourth proportional to 19,921.95, 29,885.09 and 7,447.95 is: 11,172.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,921.95 : 29,885.09 = 7,447.95 : x
  2. Step 2: Convert to fraction form
    19,921.95/29,885.09 = 7,447.95/x
  3. Step 3: Cross multiply
    19,921.95x = 29,885.09 × 7,447.95
  4. Step 4: Simplify right side
    19,921.95x = 222,582,618.83
  5. Step 5: Solve for x
    x = 222,582,618.83/19,921.95
  6. Step 6: Final answer
    x = 11,172.73

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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.