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Finding the Fourth Proportional to 285,917.20, 428,875.80 and 128,453.20

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Solution

The fourth proportional to 285,917.20, 428,875.80 and 128,453.20 is: 192,679.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,917.20 : 428,875.80 = 128,453.20 : x
  2. Step 2: Convert to fraction form
    285,917.20/428,875.80 = 128,453.20/x
  3. Step 3: Cross multiply
    285,917.20x = 428,875.80 × 128,453.20
  4. Step 4: Simplify right side
    285,917.20x = 55,090,468,912.56
  5. Step 5: Solve for x
    x = 55,090,468,912.56/285,917.20
  6. Step 6: Final answer
    x = 192,679.80

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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.