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Finding the Fourth Proportional to 111,739.68, 154,203.48 and 61,438.68

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Solution

The fourth proportional to 111,739.68, 154,203.48 and 61,438.68 is: 84,786.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,739.68 : 154,203.48 = 61,438.68 : x
  2. Step 2: Convert to fraction form
    111,739.68/154,203.48 = 61,438.68/x
  3. Step 3: Cross multiply
    111,739.68x = 154,203.48 × 61,438.68
  4. Step 4: Simplify right side
    111,739.68x = 9,474,058,262.61
  5. Step 5: Solve for x
    x = 9,474,058,262.61/111,739.68
  6. Step 6: Final answer
    x = 84,786.87

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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.