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Finding the Fourth Proportional to 392,693.38, 589,040.06 and 126,480.80

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Solution

The fourth proportional to 392,693.38, 589,040.06 and 126,480.80 is: 189,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,693.38 : 589,040.06 = 126,480.80 : x
  2. Step 2: Convert to fraction form
    392,693.38/589,040.06 = 126,480.80/x
  3. Step 3: Cross multiply
    392,693.38x = 589,040.06 × 126,480.80
  4. Step 4: Simplify right side
    392,693.38x = 74,502,258,020.85
  5. Step 5: Solve for x
    x = 74,502,258,020.85/392,693.38
  6. Step 6: Final answer
    x = 189,721.20

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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.