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Finding the Fourth Proportional to 28,368.78, 39,120.75 and 22,388.46

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Solution

The fourth proportional to 28,368.78, 39,120.75 and 22,388.46 is: 30,873.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,368.78 : 39,120.75 = 22,388.46 : x
  2. Step 2: Convert to fraction form
    28,368.78/39,120.75 = 22,388.46/x
  3. Step 3: Cross multiply
    28,368.78x = 39,120.75 × 22,388.46
  4. Step 4: Simplify right side
    28,368.78x = 875,853,346.55
  5. Step 5: Solve for x
    x = 875,853,346.55/28,368.78
  6. Step 6: Final answer
    x = 30,873.85

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.