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Finding the Fourth Proportional to 218,756.69, 328,124.06 and 85,661.34

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Solution

The fourth proportional to 218,756.69, 328,124.06 and 85,661.34 is: 128,487.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,756.69 : 328,124.06 = 85,661.34 : x
  2. Step 2: Convert to fraction form
    218,756.69/328,124.06 = 85,661.34/x
  3. Step 3: Cross multiply
    218,756.69x = 328,124.06 × 85,661.34
  4. Step 4: Simplify right side
    218,756.69x = 28,107,546,665.84
  5. Step 5: Solve for x
    x = 28,107,546,665.84/218,756.69
  6. Step 6: Final answer
    x = 128,487.71

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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.