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Finding the Fourth Proportional to 18,971.22, 28,459.89 and 7,125.91

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Solution

The fourth proportional to 18,971.22, 28,459.89 and 7,125.91 is: 10,690.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.22 : 28,459.89 = 7,125.91 : x
  2. Step 2: Convert to fraction form
    18,971.22/28,459.89 = 7,125.91/x
  3. Step 3: Cross multiply
    18,971.22x = 28,459.89 × 7,125.91
  4. Step 4: Simplify right side
    18,971.22x = 202,802,614.75
  5. Step 5: Solve for x
    x = 202,802,614.75/18,971.22
  6. Step 6: Final answer
    x = 10,690.01

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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.