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Finding the Fourth Proportional to 104,310.48, 143,855.56 and 81,915.60

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Solution

The fourth proportional to 104,310.48, 143,855.56 and 81,915.60 is: 112,970.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,310.48 : 143,855.56 = 81,915.60 : x
  2. Step 2: Convert to fraction form
    104,310.48/143,855.56 = 81,915.60/x
  3. Step 3: Cross multiply
    104,310.48x = 143,855.56 × 81,915.60
  4. Step 4: Simplify right side
    104,310.48x = 11,784,014,510.74
  5. Step 5: Solve for x
    x = 11,784,014,510.74/104,310.48
  6. Step 6: Final answer
    x = 112,970.57

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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.