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Finding the Fourth Proportional to 100,858.39, 151,311.28 and 56,515.75

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Solution

The fourth proportional to 100,858.39, 151,311.28 and 56,515.75 is: 84,786.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,858.39 : 151,311.28 = 56,515.75 : x
  2. Step 2: Convert to fraction form
    100,858.39/151,311.28 = 56,515.75/x
  3. Step 3: Cross multiply
    100,858.39x = 151,311.28 × 56,515.75
  4. Step 4: Simplify right side
    100,858.39x = 8,551,470,732.44
  5. Step 5: Solve for x
    x = 8,551,470,732.44/100,858.39
  6. Step 6: Final answer
    x = 84,786.90

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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.