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Finding the Fourth Proportional to 61,100.37, 91,664.87 and 18,978.30

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Solution

The fourth proportional to 61,100.37, 91,664.87 and 18,978.30 is: 28,471.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,100.37 : 91,664.87 = 18,978.30 : x
  2. Step 2: Convert to fraction form
    61,100.37/91,664.87 = 18,978.30/x
  3. Step 3: Cross multiply
    61,100.37x = 91,664.87 × 18,978.30
  4. Step 4: Simplify right side
    61,100.37x = 1,739,643,402.32
  5. Step 5: Solve for x
    x = 1,739,643,402.32/61,100.37
  6. Step 6: Final answer
    x = 28,471.90

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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.