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Finding the Fourth Proportional to 218,928.80, 328,393.20 and 78,701.60

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Solution

The fourth proportional to 218,928.80, 328,393.20 and 78,701.60 is: 118,052.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,928.80 : 328,393.20 = 78,701.60 : x
  2. Step 2: Convert to fraction form
    218,928.80/328,393.20 = 78,701.60/x
  3. Step 3: Cross multiply
    218,928.80x = 328,393.20 × 78,701.60
  4. Step 4: Simplify right side
    218,928.80x = 25,845,070,269.12
  5. Step 5: Solve for x
    x = 25,845,070,269.12/218,928.80
  6. Step 6: Final answer
    x = 118,052.40

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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.