Home / 21,269.79-31,893.96-12,388.05

Finding the Fourth Proportional to 21,269.79, 31,893.96 and 12,388.05

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Solution

The fourth proportional to 21,269.79, 31,893.96 and 12,388.05 is: 18,575.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,269.79 : 31,893.96 = 12,388.05 : x
  2. Step 2: Convert to fraction form
    21,269.79/31,893.96 = 12,388.05/x
  3. Step 3: Cross multiply
    21,269.79x = 31,893.96 × 12,388.05
  4. Step 4: Simplify right side
    21,269.79x = 395,103,971.18
  5. Step 5: Solve for x
    x = 395,103,971.18/21,269.79
  6. Step 6: Final answer
    x = 18,575.83

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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.