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Finding the Fourth Proportional to 258,048.60, 387,072.90 and 198,999.60

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Solution

The fourth proportional to 258,048.60, 387,072.90 and 198,999.60 is: 298,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,048.60 : 387,072.90 = 198,999.60 : x
  2. Step 2: Convert to fraction form
    258,048.60/387,072.90 = 198,999.60/x
  3. Step 3: Cross multiply
    258,048.60x = 387,072.90 × 198,999.60
  4. Step 4: Simplify right side
    258,048.60x = 77,027,352,270.84
  5. Step 5: Solve for x
    x = 77,027,352,270.84/258,048.60
  6. Step 6: Final answer
    x = 298,499.40

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Similar ratio
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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.