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Finding the Fourth Proportional to 189,376.60, 261,229.52 and 121,369.40

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Solution

The fourth proportional to 189,376.60, 261,229.52 and 121,369.40 is: 167,419.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,376.60 : 261,229.52 = 121,369.40 : x
  2. Step 2: Convert to fraction form
    189,376.60/261,229.52 = 121,369.40/x
  3. Step 3: Cross multiply
    189,376.60x = 261,229.52 × 121,369.40
  4. Step 4: Simplify right side
    189,376.60x = 31,705,270,104.69
  5. Step 5: Solve for x
    x = 31,705,270,104.69/189,376.60
  6. Step 6: Final answer
    x = 167,419.15

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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.