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Finding the Fourth Proportional to 298,986.72, 448,535.36 and 85,745.68

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Solution

The fourth proportional to 298,986.72, 448,535.36 and 85,745.68 is: 128,634.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    298,986.72 : 448,535.36 = 85,745.68 : x
  2. Step 2: Convert to fraction form
    298,986.72/448,535.36 = 85,745.68/x
  3. Step 3: Cross multiply
    298,986.72x = 448,535.36 × 85,745.68
  4. Step 4: Simplify right side
    298,986.72x = 38,459,969,447.24
  5. Step 5: Solve for x
    x = 38,459,969,447.24/298,986.72
  6. Step 6: Final answer
    x = 128,634.37

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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.