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Finding the Fourth Proportional to 198,698.40, 298,047.60 and 135,712.80

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Solution

The fourth proportional to 198,698.40, 298,047.60 and 135,712.80 is: 203,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,698.40 : 298,047.60 = 135,712.80 : x
  2. Step 2: Convert to fraction form
    198,698.40/298,047.60 = 135,712.80/x
  3. Step 3: Cross multiply
    198,698.40x = 298,047.60 × 135,712.80
  4. Step 4: Simplify right side
    198,698.40x = 40,448,874,329.28
  5. Step 5: Solve for x
    x = 40,448,874,329.28/198,698.40
  6. Step 6: Final answer
    x = 203,569.20

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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.