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Finding the Fourth Proportional to 18,954.35, 28,384.80 and 11,916.90

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Solution

The fourth proportional to 18,954.35, 28,384.80 and 11,916.90 is: 17,845.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.35 : 28,384.80 = 11,916.90 : x
  2. Step 2: Convert to fraction form
    18,954.35/28,384.80 = 11,916.90/x
  3. Step 3: Cross multiply
    18,954.35x = 28,384.80 × 11,916.90
  4. Step 4: Simplify right side
    18,954.35x = 338,258,763.54
  5. Step 5: Solve for x
    x = 338,258,763.54/18,954.35
  6. Step 6: Final answer
    x = 17,845.97

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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.