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Finding the Fourth Proportional to 57,739.20, 86,608.80 and 42,187.20

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Solution

The fourth proportional to 57,739.20, 86,608.80 and 42,187.20 is: 63,280.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,739.20 : 86,608.80 = 42,187.20 : x
  2. Step 2: Convert to fraction form
    57,739.20/86,608.80 = 42,187.20/x
  3. Step 3: Cross multiply
    57,739.20x = 86,608.80 × 42,187.20
  4. Step 4: Simplify right side
    57,739.20x = 3,653,782,767.36
  5. Step 5: Solve for x
    x = 3,653,782,767.36/57,739.20
  6. Step 6: Final answer
    x = 63,280.80

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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.