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Finding the Fourth Proportional to 127,858.40, 191,787.60 and 71,871.20

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Solution

The fourth proportional to 127,858.40, 191,787.60 and 71,871.20 is: 107,806.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,858.40 : 191,787.60 = 71,871.20 : x
  2. Step 2: Convert to fraction form
    127,858.40/191,787.60 = 71,871.20/x
  3. Step 3: Cross multiply
    127,858.40x = 191,787.60 × 71,871.20
  4. Step 4: Simplify right side
    127,858.40x = 13,784,004,957.12
  5. Step 5: Solve for x
    x = 13,784,004,957.12/127,858.40
  6. Step 6: Final answer
    x = 107,806.80

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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.