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Finding the Fourth Proportional to 218,783.42, 328,043.80 and 85,504.90

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Solution

The fourth proportional to 218,783.42, 328,043.80 and 85,504.90 is: 128,206.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,783.42 : 328,043.80 = 85,504.90 : x
  2. Step 2: Convert to fraction form
    218,783.42/328,043.80 = 85,504.90/x
  3. Step 3: Cross multiply
    218,783.42x = 328,043.80 × 85,504.90
  4. Step 4: Simplify right side
    218,783.42x = 28,049,352,314.62
  5. Step 5: Solve for x
    x = 28,049,352,314.62/218,783.42
  6. Step 6: Final answer
    x = 128,206.02

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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.