Home / 189,372.80-261,334.31-121,389.72

Finding the Fourth Proportional to 189,372.80, 261,334.31 and 121,389.72

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Solution

The fourth proportional to 189,372.80, 261,334.31 and 121,389.72 is: 167,517.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,372.80 : 261,334.31 = 121,389.72 : x
  2. Step 2: Convert to fraction form
    189,372.80/261,334.31 = 121,389.72/x
  3. Step 3: Cross multiply
    189,372.80x = 261,334.31 × 121,389.72
  4. Step 4: Simplify right side
    189,372.80x = 31,723,298,565.56
  5. Step 5: Solve for x
    x = 31,723,298,565.56/189,372.80
  6. Step 6: Final answer
    x = 167,517.72

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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.