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Finding the Fourth Proportional to 59,978.21, 90,021.92 and 31,921.83

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Solution

The fourth proportional to 59,978.21, 90,021.92 and 31,921.83 is: 47,911.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    59,978.21 : 90,021.92 = 31,921.83 : x
  2. Step 2: Convert to fraction form
    59,978.21/90,021.92 = 31,921.83/x
  3. Step 3: Cross multiply
    59,978.21x = 90,021.92 × 31,921.83
  4. Step 4: Simplify right side
    59,978.21x = 2,873,664,266.90
  5. Step 5: Solve for x
    x = 2,873,664,266.90/59,978.21
  6. Step 6: Final answer
    x = 47,911.81

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.