Home / 105,129.20-145,078.92-57,381.52

Finding the Fourth Proportional to 105,129.20, 145,078.92 and 57,381.52

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Solution

The fourth proportional to 105,129.20, 145,078.92 and 57,381.52 is: 79,186.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,129.20 : 145,078.92 = 57,381.52 : x
  2. Step 2: Convert to fraction form
    105,129.20/145,078.92 = 57,381.52/x
  3. Step 3: Cross multiply
    105,129.20x = 145,078.92 × 57,381.52
  4. Step 4: Simplify right side
    105,129.20x = 8,324,848,949.56
  5. Step 5: Solve for x
    x = 8,324,848,949.56/105,129.20
  6. Step 6: Final answer
    x = 79,186.84

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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.