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Finding the Fourth Proportional to 28,921, 39,911.04 and 15,673

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Solution

The fourth proportional to 28,921, 39,911.04 and 15,673 is: 21,628.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,921 : 39,911.04 = 15,673 : x
  2. Step 2: Convert to fraction form
    28,921/39,911.04 = 15,673/x
  3. Step 3: Cross multiply
    28,921x = 39,911.04 × 15,673
  4. Step 4: Simplify right side
    28,921x = 625,525,729.92
  5. Step 5: Solve for x
    x = 625,525,729.92/28,921
  6. Step 6: Final answer
    x = 21,628.77

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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.