Home / 189,431.01-261,415.34-103,390.78

Finding the Fourth Proportional to 189,431.01, 261,415.34 and 103,390.78

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Solution

The fourth proportional to 189,431.01, 261,415.34 and 103,390.78 is: 142,679.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,431.01 : 261,415.34 = 103,390.78 : x
  2. Step 2: Convert to fraction form
    189,431.01/261,415.34 = 103,390.78/x
  3. Step 3: Cross multiply
    189,431.01x = 261,415.34 × 103,390.78
  4. Step 4: Simplify right side
    189,431.01x = 27,027,935,906.57
  5. Step 5: Solve for x
    x = 27,027,935,906.57/189,431.01
  6. Step 6: Final answer
    x = 142,679.57

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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.