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Finding the Fourth Proportional to 131,703.20, 198,015.60 and 128,938.40

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Solution

The fourth proportional to 131,703.20, 198,015.60 and 128,938.40 is: 193,858.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,703.20 : 198,015.60 = 128,938.40 : x
  2. Step 2: Convert to fraction form
    131,703.20/198,015.60 = 128,938.40/x
  3. Step 3: Cross multiply
    131,703.20x = 198,015.60 × 128,938.40
  4. Step 4: Simplify right side
    131,703.20x = 25,531,814,639.04
  5. Step 5: Solve for x
    x = 25,531,814,639.04/131,703.20
  6. Step 6: Final answer
    x = 193,858.73

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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.