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Finding the Fourth Proportional to 28,749.86, 39,693.03 and 19,690.41

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Solution

The fourth proportional to 28,749.86, 39,693.03 and 19,690.41 is: 27,185.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,749.86 : 39,693.03 = 19,690.41 : x
  2. Step 2: Convert to fraction form
    28,749.86/39,693.03 = 19,690.41/x
  3. Step 3: Cross multiply
    28,749.86x = 39,693.03 × 19,690.41
  4. Step 4: Simplify right side
    28,749.86x = 781,572,034.84
  5. Step 5: Solve for x
    x = 781,572,034.84/28,749.86
  6. Step 6: Final answer
    x = 27,185.25

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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.