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Finding the Fourth Proportional to 218,980.20, 328,470.30 and 85,816.20

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Solution

The fourth proportional to 218,980.20, 328,470.30 and 85,816.20 is: 128,724.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,980.20 : 328,470.30 = 85,816.20 : x
  2. Step 2: Convert to fraction form
    218,980.20/328,470.30 = 85,816.20/x
  3. Step 3: Cross multiply
    218,980.20x = 328,470.30 × 85,816.20
  4. Step 4: Simplify right side
    218,980.20x = 28,188,072,958.86
  5. Step 5: Solve for x
    x = 28,188,072,958.86/218,980.20
  6. Step 6: Final answer
    x = 128,724.30

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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.