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Finding the Fourth Proportional to 22,821.40, 31,508.42 and 20,427.32

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Solution

The fourth proportional to 22,821.40, 31,508.42 and 20,427.32 is: 28,203.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,821.40 : 31,508.42 = 20,427.32 : x
  2. Step 2: Convert to fraction form
    22,821.40/31,508.42 = 20,427.32/x
  3. Step 3: Cross multiply
    22,821.40x = 31,508.42 × 20,427.32
  4. Step 4: Simplify right side
    22,821.40x = 643,632,578.03
  5. Step 5: Solve for x
    x = 643,632,578.03/22,821.40
  6. Step 6: Final answer
    x = 28,203.03

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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.