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Finding the Fourth Proportional to 68,111.20, 102,159.60 and 21,361.60

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Solution

The fourth proportional to 68,111.20, 102,159.60 and 21,361.60 is: 32,040.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,111.20 : 102,159.60 = 21,361.60 : x
  2. Step 2: Convert to fraction form
    68,111.20/102,159.60 = 21,361.60/x
  3. Step 3: Cross multiply
    68,111.20x = 102,159.60 × 21,361.60
  4. Step 4: Simplify right side
    68,111.20x = 2,182,292,511.36
  5. Step 5: Solve for x
    x = 2,182,292,511.36/68,111.20
  6. Step 6: Final answer
    x = 32,040.14

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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.