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Finding the Fourth Proportional to 21,798.36, 30,072.60 and 13,410

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Solution

The fourth proportional to 21,798.36, 30,072.60 and 13,410 is: 18,500.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,798.36 : 30,072.60 = 13,410 : x
  2. Step 2: Convert to fraction form
    21,798.36/30,072.60 = 13,410/x
  3. Step 3: Cross multiply
    21,798.36x = 30,072.60 × 13,410
  4. Step 4: Simplify right side
    21,798.36x = 403,273,566
  5. Step 5: Solve for x
    x = 403,273,566/21,798.36
  6. Step 6: Final answer
    x = 18,500.18

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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.