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Finding the Fourth Proportional to 203,686.38, 305,406.78 and 91,346.28

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Solution

The fourth proportional to 203,686.38, 305,406.78 and 91,346.28 is: 136,964.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,686.38 : 305,406.78 = 91,346.28 : x
  2. Step 2: Convert to fraction form
    203,686.38/305,406.78 = 91,346.28/x
  3. Step 3: Cross multiply
    203,686.38x = 305,406.78 × 91,346.28
  4. Step 4: Simplify right side
    203,686.38x = 27,897,773,239.78
  5. Step 5: Solve for x
    x = 27,897,773,239.78/203,686.38
  6. Step 6: Final answer
    x = 136,964.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.