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Finding the Fourth Proportional to 218,612.80, 327,919.20 and 130,139.20

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Solution

The fourth proportional to 218,612.80, 327,919.20 and 130,139.20 is: 195,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,612.80 : 327,919.20 = 130,139.20 : x
  2. Step 2: Convert to fraction form
    218,612.80/327,919.20 = 130,139.20/x
  3. Step 3: Cross multiply
    218,612.80x = 327,919.20 × 130,139.20
  4. Step 4: Simplify right side
    218,612.80x = 42,675,142,352.64
  5. Step 5: Solve for x
    x = 42,675,142,352.64/218,612.80
  6. Step 6: Final answer
    x = 195,208.80

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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.