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Finding the Fourth Proportional to 218,813.80, 328,220.70 and 78,586.60

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Solution

The fourth proportional to 218,813.80, 328,220.70 and 78,586.60 is: 117,879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,813.80 : 328,220.70 = 78,586.60 : x
  2. Step 2: Convert to fraction form
    218,813.80/328,220.70 = 78,586.60/x
  3. Step 3: Cross multiply
    218,813.80x = 328,220.70 × 78,586.60
  4. Step 4: Simplify right side
    218,813.80x = 25,793,748,862.62
  5. Step 5: Solve for x
    x = 25,793,748,862.62/218,813.80
  6. Step 6: Final answer
    x = 117,879.90

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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.