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Finding the Fourth Proportional to 218,855.81, 328,056.09 and 92,390.51

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Solution

The fourth proportional to 218,855.81, 328,056.09 and 92,390.51 is: 138,489.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,855.81 : 328,056.09 = 92,390.51 : x
  2. Step 2: Convert to fraction form
    218,855.81/328,056.09 = 92,390.51/x
  3. Step 3: Cross multiply
    218,855.81x = 328,056.09 × 92,390.51
  4. Step 4: Simplify right side
    218,855.81x = 30,309,267,823.43
  5. Step 5: Solve for x
    x = 30,309,267,823.43/218,855.81
  6. Step 6: Final answer
    x = 138,489.67

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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.