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Finding the Fourth Proportional to 21,007.49, 28,990.96 and 11,448

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Solution

The fourth proportional to 21,007.49, 28,990.96 and 11,448 is: 15,798.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.49 : 28,990.96 = 11,448 : x
  2. Step 2: Convert to fraction form
    21,007.49/28,990.96 = 11,448/x
  3. Step 3: Cross multiply
    21,007.49x = 28,990.96 × 11,448
  4. Step 4: Simplify right side
    21,007.49x = 331,888,481.46
  5. Step 5: Solve for x
    x = 331,888,481.46/21,007.49
  6. Step 6: Final answer
    x = 15,798.58

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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.