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Finding the Fourth Proportional to 85,400.60, 128,123.30 and 32,811.80

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Solution

The fourth proportional to 85,400.60, 128,123.30 and 32,811.80 is: 49,226.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,400.60 : 128,123.30 = 32,811.80 : x
  2. Step 2: Convert to fraction form
    85,400.60/128,123.30 = 32,811.80/x
  3. Step 3: Cross multiply
    85,400.60x = 128,123.30 × 32,811.80
  4. Step 4: Simplify right side
    85,400.60x = 4,203,956,094.94
  5. Step 5: Solve for x
    x = 4,203,956,094.94/85,400.60
  6. Step 6: Final answer
    x = 49,226.31

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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.