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Finding the Fourth Proportional to 321,639.54, 482,476.61 and 84,975.76

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Solution

The fourth proportional to 321,639.54, 482,476.61 and 84,975.76 is: 127,468.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,639.54 : 482,476.61 = 84,975.76 : x
  2. Step 2: Convert to fraction form
    321,639.54/482,476.61 = 84,975.76/x
  3. Step 3: Cross multiply
    321,639.54x = 482,476.61 × 84,975.76
  4. Step 4: Simplify right side
    321,639.54x = 40,998,816,616.97
  5. Step 5: Solve for x
    x = 40,998,816,616.97/321,639.54
  6. Step 6: Final answer
    x = 127,468.21

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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.