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Finding the Fourth Proportional to 218,783.28, 328,043.52 and 85,504.72

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Solution

The fourth proportional to 218,783.28, 328,043.52 and 85,504.72 is: 128,205.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,783.28 : 328,043.52 = 85,504.72 : x
  2. Step 2: Convert to fraction form
    218,783.28/328,043.52 = 85,504.72/x
  3. Step 3: Cross multiply
    218,783.28x = 328,043.52 × 85,504.72
  4. Step 4: Simplify right side
    218,783.28x = 28,049,269,325.41
  5. Step 5: Solve for x
    x = 28,049,269,325.41/218,783.28
  6. Step 6: Final answer
    x = 128,205.73

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1.5x scale

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.