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Finding the Fourth Proportional to 55,978.74, 83,938.86 and 20,889.54

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Solution

The fourth proportional to 55,978.74, 83,938.86 and 20,889.54 is: 31,323.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,978.74 : 83,938.86 = 20,889.54 : x
  2. Step 2: Convert to fraction form
    55,978.74/83,938.86 = 20,889.54/x
  3. Step 3: Cross multiply
    55,978.74x = 83,938.86 × 20,889.54
  4. Step 4: Simplify right side
    55,978.74x = 1,753,444,173.52
  5. Step 5: Solve for x
    x = 1,753,444,173.52/55,978.74
  6. Step 6: Final answer
    x = 31,323.39

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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.