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Finding the Fourth Proportional to 220,627.94, 330,961.61 and 85,688.79

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Solution

The fourth proportional to 220,627.94, 330,961.61 and 85,688.79 is: 128,540.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,627.94 : 330,961.61 = 85,688.79 : x
  2. Step 2: Convert to fraction form
    220,627.94/330,961.61 = 85,688.79/x
  3. Step 3: Cross multiply
    220,627.94x = 330,961.61 × 85,688.79
  4. Step 4: Simplify right side
    220,627.94x = 28,359,699,468.91
  5. Step 5: Solve for x
    x = 28,359,699,468.91/220,627.94
  6. Step 6: Final answer
    x = 128,540.84

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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.