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Finding the Fourth Proportional to 386,019.40, 579,000.30 and 161,321.80

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Solution

The fourth proportional to 386,019.40, 579,000.30 and 161,321.80 is: 241,970.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,019.40 : 579,000.30 = 161,321.80 : x
  2. Step 2: Convert to fraction form
    386,019.40/579,000.30 = 161,321.80/x
  3. Step 3: Cross multiply
    386,019.40x = 579,000.30 × 161,321.80
  4. Step 4: Simplify right side
    386,019.40x = 93,405,370,596.54
  5. Step 5: Solve for x
    x = 93,405,370,596.54/386,019.40
  6. Step 6: Final answer
    x = 241,970.66

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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.