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Finding the Fourth Proportional to 57,321, 79,134.37 and 40,119.84

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Solution

The fourth proportional to 57,321, 79,134.37 and 40,119.84 is: 55,387.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,321 : 79,134.37 = 40,119.84 : x
  2. Step 2: Convert to fraction form
    57,321/79,134.37 = 40,119.84/x
  3. Step 3: Cross multiply
    57,321x = 79,134.37 × 40,119.84
  4. Step 4: Simplify right side
    57,321x = 3,174,858,162.60
  5. Step 5: Solve for x
    x = 3,174,858,162.60/57,321
  6. Step 6: Final answer
    x = 55,387.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.