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Finding the Fourth Proportional to 218,139.21, 327,145.59 and 84,989.79

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Solution

The fourth proportional to 218,139.21, 327,145.59 and 84,989.79 is: 127,460.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,139.21 : 327,145.59 = 84,989.79 : x
  2. Step 2: Convert to fraction form
    218,139.21/327,145.59 = 84,989.79/x
  3. Step 3: Cross multiply
    218,139.21x = 327,145.59 × 84,989.79
  4. Step 4: Simplify right side
    218,139.21x = 27,804,034,993.53
  5. Step 5: Solve for x
    x = 27,804,034,993.53/218,139.21
  6. Step 6: Final answer
    x = 127,460.05

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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.