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Finding the Fourth Proportional to 189,373.80, 261,335.69 and 121,390.72

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Solution

The fourth proportional to 189,373.80, 261,335.69 and 121,390.72 is: 167,519.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,373.80 : 261,335.69 = 121,390.72 : x
  2. Step 2: Convert to fraction form
    189,373.80/261,335.69 = 121,390.72/x
  3. Step 3: Cross multiply
    189,373.80x = 261,335.69 × 121,390.72
  4. Step 4: Simplify right side
    189,373.80x = 31,723,727,570.80
  5. Step 5: Solve for x
    x = 31,723,727,570.80/189,373.80
  6. Step 6: Final answer
    x = 167,519.09

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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.