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Finding the Fourth Proportional to 18,731.70, 28,109.70 and 10,834.20

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Solution

The fourth proportional to 18,731.70, 28,109.70 and 10,834.20 is: 16,258.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.70 : 28,109.70 = 10,834.20 : x
  2. Step 2: Convert to fraction form
    18,731.70/28,109.70 = 10,834.20/x
  3. Step 3: Cross multiply
    18,731.70x = 28,109.70 × 10,834.20
  4. Step 4: Simplify right side
    18,731.70x = 304,546,111.74
  5. Step 5: Solve for x
    x = 304,546,111.74/18,731.70
  6. Step 6: Final answer
    x = 16,258.33

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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.