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Finding the Fourth Proportional to 18,750.50, 28,111.87 and 11,353.22

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Solution

The fourth proportional to 18,750.50, 28,111.87 and 11,353.22 is: 17,021.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,750.50 : 28,111.87 = 11,353.22 : x
  2. Step 2: Convert to fraction form
    18,750.50/28,111.87 = 11,353.22/x
  3. Step 3: Cross multiply
    18,750.50x = 28,111.87 × 11,353.22
  4. Step 4: Simplify right side
    18,750.50x = 319,160,187.96
  5. Step 5: Solve for x
    x = 319,160,187.96/18,750.50
  6. Step 6: Final answer
    x = 17,021.42

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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.