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Finding the Fourth Proportional to 21,916.40, 32,874.60 and 18,076.40

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Solution

The fourth proportional to 21,916.40, 32,874.60 and 18,076.40 is: 27,114.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,916.40 : 32,874.60 = 18,076.40 : x
  2. Step 2: Convert to fraction form
    21,916.40/32,874.60 = 18,076.40/x
  3. Step 3: Cross multiply
    21,916.40x = 32,874.60 × 18,076.40
  4. Step 4: Simplify right side
    21,916.40x = 594,254,419.44
  5. Step 5: Solve for x
    x = 594,254,419.44/21,916.40
  6. Step 6: Final answer
    x = 27,114.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.