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Finding the Fourth Proportional to 74,431.60, 111,474.60 and 72,703.60

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Solution

The fourth proportional to 74,431.60, 111,474.60 and 72,703.60 is: 108,886.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,431.60 : 111,474.60 = 72,703.60 : x
  2. Step 2: Convert to fraction form
    74,431.60/111,474.60 = 72,703.60/x
  3. Step 3: Cross multiply
    74,431.60x = 111,474.60 × 72,703.60
  4. Step 4: Simplify right side
    74,431.60x = 8,104,604,728.56
  5. Step 5: Solve for x
    x = 8,104,604,728.56/74,431.60
  6. Step 6: Final answer
    x = 108,886.61

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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.