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Finding the Fourth Proportional to 19,990.71, 29,969.06 and 12,204.99

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Solution

The fourth proportional to 19,990.71, 29,969.06 and 12,204.99 is: 18,297.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.71 : 29,969.06 = 12,204.99 : x
  2. Step 2: Convert to fraction form
    19,990.71/29,969.06 = 12,204.99/x
  3. Step 3: Cross multiply
    19,990.71x = 29,969.06 × 12,204.99
  4. Step 4: Simplify right side
    19,990.71x = 365,772,016.58
  5. Step 5: Solve for x
    x = 365,772,016.58/19,990.71
  6. Step 6: Final answer
    x = 18,297.10

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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.