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Finding the Fourth Proportional to 81,392.64, 122,090.58 and 53,490.57

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Solution

The fourth proportional to 81,392.64, 122,090.58 and 53,490.57 is: 80,236.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,392.64 : 122,090.58 = 53,490.57 : x
  2. Step 2: Convert to fraction form
    81,392.64/122,090.58 = 53,490.57/x
  3. Step 3: Cross multiply
    81,392.64x = 122,090.58 × 53,490.57
  4. Step 4: Simplify right side
    81,392.64x = 6,530,694,715.83
  5. Step 5: Solve for x
    x = 6,530,694,715.83/81,392.64
  6. Step 6: Final answer
    x = 80,236.92

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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.