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Finding the Fourth Proportional to 21,006, 28,988.36 and 11,574.56

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Solution

The fourth proportional to 21,006, 28,988.36 and 11,574.56 is: 15,972.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006 : 28,988.36 = 11,574.56 : x
  2. Step 2: Convert to fraction form
    21,006/28,988.36 = 11,574.56/x
  3. Step 3: Cross multiply
    21,006x = 28,988.36 × 11,574.56
  4. Step 4: Simplify right side
    21,006x = 335,527,512.12
  5. Step 5: Solve for x
    x = 335,527,512.12/21,006
  6. Step 6: Final answer
    x = 15,972.94

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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.