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Finding the Fourth Proportional to 153,999.20, 230,998.80 and 128,079.20

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Solution

The fourth proportional to 153,999.20, 230,998.80 and 128,079.20 is: 192,118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,999.20 : 230,998.80 = 128,079.20 : x
  2. Step 2: Convert to fraction form
    153,999.20/230,998.80 = 128,079.20/x
  3. Step 3: Cross multiply
    153,999.20x = 230,998.80 × 128,079.20
  4. Step 4: Simplify right side
    153,999.20x = 29,586,141,504.96
  5. Step 5: Solve for x
    x = 29,586,141,504.96/153,999.20
  6. Step 6: Final answer
    x = 192,118.80

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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.