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Finding the Fourth Proportional to 218,914.80, 328,372.20 and 78,687.60

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Solution

The fourth proportional to 218,914.80, 328,372.20 and 78,687.60 is: 118,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,914.80 : 328,372.20 = 78,687.60 : x
  2. Step 2: Convert to fraction form
    218,914.80/328,372.20 = 78,687.60/x
  3. Step 3: Cross multiply
    218,914.80x = 328,372.20 × 78,687.60
  4. Step 4: Simplify right side
    218,914.80x = 25,838,820,324.72
  5. Step 5: Solve for x
    x = 25,838,820,324.72/218,914.80
  6. Step 6: Final answer
    x = 118,031.40

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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.