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Finding the Fourth Proportional to 28,784.03, 39,699.45 and 18,715.73

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Solution

The fourth proportional to 28,784.03, 39,699.45 and 18,715.73 is: 25,813.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,784.03 : 39,699.45 = 18,715.73 : x
  2. Step 2: Convert to fraction form
    28,784.03/39,699.45 = 18,715.73/x
  3. Step 3: Cross multiply
    28,784.03x = 39,699.45 × 18,715.73
  4. Step 4: Simplify right side
    28,784.03x = 743,004,187.35
  5. Step 5: Solve for x
    x = 743,004,187.35/28,784.03
  6. Step 6: Final answer
    x = 25,813.07

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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.