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Finding the Fourth Proportional to 215,913.84, 323,880.48 and 66,143.22

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Solution

The fourth proportional to 215,913.84, 323,880.48 and 66,143.22 is: 99,217.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,913.84 : 323,880.48 = 66,143.22 : x
  2. Step 2: Convert to fraction form
    215,913.84/323,880.48 = 66,143.22/x
  3. Step 3: Cross multiply
    215,913.84x = 323,880.48 × 66,143.22
  4. Step 4: Simplify right side
    215,913.84x = 21,422,497,842.35
  5. Step 5: Solve for x
    x = 21,422,497,842.35/215,913.84
  6. Step 6: Final answer
    x = 99,217.81

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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.