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Finding the Fourth Proportional to 21,821.58, 30,114.65 and 12,391.02

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Solution

The fourth proportional to 21,821.58, 30,114.65 and 12,391.02 is: 17,100.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.58 : 30,114.65 = 12,391.02 : x
  2. Step 2: Convert to fraction form
    21,821.58/30,114.65 = 12,391.02/x
  3. Step 3: Cross multiply
    21,821.58x = 30,114.65 × 12,391.02
  4. Step 4: Simplify right side
    21,821.58x = 373,151,230.44
  5. Step 5: Solve for x
    x = 373,151,230.44/21,821.58
  6. Step 6: Final answer
    x = 17,100.10

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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.