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Finding the Fourth Proportional to 21,012, 28,996.56 and 12,628.50

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Solution

The fourth proportional to 21,012, 28,996.56 and 12,628.50 is: 17,427.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012 : 28,996.56 = 12,628.50 : x
  2. Step 2: Convert to fraction form
    21,012/28,996.56 = 12,628.50/x
  3. Step 3: Cross multiply
    21,012x = 28,996.56 × 12,628.50
  4. Step 4: Simplify right side
    21,012x = 366,183,057.96
  5. Step 5: Solve for x
    x = 366,183,057.96/21,012
  6. Step 6: Final answer
    x = 17,427.33

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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.