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Finding the Fourth Proportional to 38,969.69, 53,778.74 and 21,974.75

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Solution

The fourth proportional to 38,969.69, 53,778.74 and 21,974.75 is: 30,325.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,969.69 : 53,778.74 = 21,974.75 : x
  2. Step 2: Convert to fraction form
    38,969.69/53,778.74 = 21,974.75/x
  3. Step 3: Cross multiply
    38,969.69x = 53,778.74 × 21,974.75
  4. Step 4: Simplify right side
    38,969.69x = 1,181,774,366.82
  5. Step 5: Solve for x
    x = 1,181,774,366.82/38,969.69
  6. Step 6: Final answer
    x = 30,325.48

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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.