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Finding the Fourth Proportional to 28,808.69, 39,771.68 and 19,904.13

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Solution

The fourth proportional to 28,808.69, 39,771.68 and 19,904.13 is: 27,478.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,808.69 : 39,771.68 = 19,904.13 : x
  2. Step 2: Convert to fraction form
    28,808.69/39,771.68 = 19,904.13/x
  3. Step 3: Cross multiply
    28,808.69x = 39,771.68 × 19,904.13
  4. Step 4: Simplify right side
    28,808.69x = 791,620,589.52
  5. Step 5: Solve for x
    x = 791,620,589.52/28,808.69
  6. Step 6: Final answer
    x = 27,478.54

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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.