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Finding the Fourth Proportional to 28,012.72, 38,640.42 and 16,674.64

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Solution

The fourth proportional to 28,012.72, 38,640.42 and 16,674.64 is: 23,000.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,012.72 : 38,640.42 = 16,674.64 : x
  2. Step 2: Convert to fraction form
    28,012.72/38,640.42 = 16,674.64/x
  3. Step 3: Cross multiply
    28,012.72x = 38,640.42 × 16,674.64
  4. Step 4: Simplify right side
    28,012.72x = 644,315,092.95
  5. Step 5: Solve for x
    x = 644,315,092.95/28,012.72
  6. Step 6: Final answer
    x = 23,000.80

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1.5x scale

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.