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Finding the Fourth Proportional to 189,435.21, 261,398.44 and 112,958.55

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Solution

The fourth proportional to 189,435.21, 261,398.44 and 112,958.55 is: 155,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,435.21 : 261,398.44 = 112,958.55 : x
  2. Step 2: Convert to fraction form
    189,435.21/261,398.44 = 112,958.55/x
  3. Step 3: Cross multiply
    189,435.21x = 261,398.44 × 112,958.55
  4. Step 4: Simplify right side
    189,435.21x = 29,527,188,895.86
  5. Step 5: Solve for x
    x = 29,527,188,895.86/189,435.21
  6. Step 6: Final answer
    x = 155,869.60

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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.