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Finding the Fourth Proportional to 320,428.60, 479,986.80 and 162,745.90

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Solution

The fourth proportional to 320,428.60, 479,986.80 and 162,745.90 is: 243,785.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,428.60 : 479,986.80 = 162,745.90 : x
  2. Step 2: Convert to fraction form
    320,428.60/479,986.80 = 162,745.90/x
  3. Step 3: Cross multiply
    320,428.60x = 479,986.80 × 162,745.90
  4. Step 4: Simplify right side
    320,428.60x = 78,115,883,754.12
  5. Step 5: Solve for x
    x = 78,115,883,754.12/320,428.60
  6. Step 6: Final answer
    x = 243,785.62

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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.