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Finding the Fourth Proportional to 28,750.65, 39,674.12 and 16,813.28

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Solution

The fourth proportional to 28,750.65, 39,674.12 and 16,813.28 is: 23,201.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,750.65 : 39,674.12 = 16,813.28 : x
  2. Step 2: Convert to fraction form
    28,750.65/39,674.12 = 16,813.28/x
  3. Step 3: Cross multiply
    28,750.65x = 39,674.12 × 16,813.28
  4. Step 4: Simplify right side
    28,750.65x = 667,051,805.88
  5. Step 5: Solve for x
    x = 667,051,805.88/28,750.65
  6. Step 6: Final answer
    x = 23,201.28

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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.