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Finding the Fourth Proportional to 18,705.42, 28,031.40 and 13,736.07

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Solution

The fourth proportional to 18,705.42, 28,031.40 and 13,736.07 is: 20,584.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.42 : 28,031.40 = 13,736.07 : x
  2. Step 2: Convert to fraction form
    18,705.42/28,031.40 = 13,736.07/x
  3. Step 3: Cross multiply
    18,705.42x = 28,031.40 × 13,736.07
  4. Step 4: Simplify right side
    18,705.42x = 385,041,272.60
  5. Step 5: Solve for x
    x = 385,041,272.60/18,705.42
  6. Step 6: Final answer
    x = 20,584.48

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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.