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Finding the Fourth Proportional to 21,012.26, 28,998 and 12,061.22

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Solution

The fourth proportional to 21,012.26, 28,998 and 12,061.22 is: 16,645.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.26 : 28,998 = 12,061.22 : x
  2. Step 2: Convert to fraction form
    21,012.26/28,998 = 12,061.22/x
  3. Step 3: Cross multiply
    21,012.26x = 28,998 × 12,061.22
  4. Step 4: Simplify right side
    21,012.26x = 349,751,257.56
  5. Step 5: Solve for x
    x = 349,751,257.56/21,012.26
  6. Step 6: Final answer
    x = 16,645.10

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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.