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Finding the Fourth Proportional to 28,752.80, 39,683.56 and 16,813.80

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Solution

The fourth proportional to 28,752.80, 39,683.56 and 16,813.80 is: 23,205.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,752.80 : 39,683.56 = 16,813.80 : x
  2. Step 2: Convert to fraction form
    28,752.80/39,683.56 = 16,813.80/x
  3. Step 3: Cross multiply
    28,752.80x = 39,683.56 × 16,813.80
  4. Step 4: Simplify right side
    28,752.80x = 667,231,441.13
  5. Step 5: Solve for x
    x = 667,231,441.13/28,752.80
  6. Step 6: Final answer
    x = 23,205.79

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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.