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Finding the Fourth Proportional to 81,787.60, 122,681.40 and 81,269.20

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Solution

The fourth proportional to 81,787.60, 122,681.40 and 81,269.20 is: 121,903.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,787.60 : 122,681.40 = 81,269.20 : x
  2. Step 2: Convert to fraction form
    81,787.60/122,681.40 = 81,269.20/x
  3. Step 3: Cross multiply
    81,787.60x = 122,681.40 × 81,269.20
  4. Step 4: Simplify right side
    81,787.60x = 9,970,219,232.88
  5. Step 5: Solve for x
    x = 9,970,219,232.88/81,787.60
  6. Step 6: Final answer
    x = 121,903.80

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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.