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Finding the Fourth Proportional to 198,701.20, 298,051.80 and 128,659.60

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Solution

The fourth proportional to 198,701.20, 298,051.80 and 128,659.60 is: 192,989.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,701.20 : 298,051.80 = 128,659.60 : x
  2. Step 2: Convert to fraction form
    198,701.20/298,051.80 = 128,659.60/x
  3. Step 3: Cross multiply
    198,701.20x = 298,051.80 × 128,659.60
  4. Step 4: Simplify right side
    198,701.20x = 38,347,225,367.28
  5. Step 5: Solve for x
    x = 38,347,225,367.28/198,701.20
  6. Step 6: Final answer
    x = 192,989.40

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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.