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Finding the Fourth Proportional to 296,858.91, 445,277.43 and 128,421.64

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Solution

The fourth proportional to 296,858.91, 445,277.43 and 128,421.64 is: 192,627.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    296,858.91 : 445,277.43 = 128,421.64 : x
  2. Step 2: Convert to fraction form
    296,858.91/445,277.43 = 128,421.64/x
  3. Step 3: Cross multiply
    296,858.91x = 445,277.43 × 128,421.64
  4. Step 4: Simplify right side
    296,858.91x = 57,183,257,815.59
  5. Step 5: Solve for x
    x = 57,183,257,815.59/296,858.91
  6. Step 6: Final answer
    x = 192,627.73

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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.