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Finding the Fourth Proportional to 218,635.60, 327,888.60 and 85,439.20

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Solution

The fourth proportional to 218,635.60, 327,888.60 and 85,439.20 is: 128,133.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,635.60 : 327,888.60 = 85,439.20 : x
  2. Step 2: Convert to fraction form
    218,635.60/327,888.60 = 85,439.20/x
  3. Step 3: Cross multiply
    218,635.60x = 327,888.60 × 85,439.20
  4. Step 4: Simplify right side
    218,635.60x = 28,014,539,673.12
  5. Step 5: Solve for x
    x = 28,014,539,673.12/218,635.60
  6. Step 6: Final answer
    x = 128,133.48

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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.