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Finding the Fourth Proportional to 74,638.40, 111,957.60 and 57,725.60

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Solution

The fourth proportional to 74,638.40, 111,957.60 and 57,725.60 is: 86,588.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,638.40 : 111,957.60 = 57,725.60 : x
  2. Step 2: Convert to fraction form
    74,638.40/111,957.60 = 57,725.60/x
  3. Step 3: Cross multiply
    74,638.40x = 111,957.60 × 57,725.60
  4. Step 4: Simplify right side
    74,638.40x = 6,462,819,634.56
  5. Step 5: Solve for x
    x = 6,462,819,634.56/74,638.40
  6. Step 6: Final answer
    x = 86,588.40

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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.