Home / 21,006.12-28,996.74-12,621

Finding the Fourth Proportional to 21,006.12, 28,996.74 and 12,621

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Solution

The fourth proportional to 21,006.12, 28,996.74 and 12,621 is: 17,421.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.12 : 28,996.74 = 12,621 : x
  2. Step 2: Convert to fraction form
    21,006.12/28,996.74 = 12,621/x
  3. Step 3: Cross multiply
    21,006.12x = 28,996.74 × 12,621
  4. Step 4: Simplify right side
    21,006.12x = 365,967,855.54
  5. Step 5: Solve for x
    x = 365,967,855.54/21,006.12
  6. Step 6: Final answer
    x = 17,421.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.