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Finding the Fourth Proportional to 386,993.72, 580,470.08 and 120,723.72

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Solution

The fourth proportional to 386,993.72, 580,470.08 and 120,723.72 is: 181,079.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,993.72 : 580,470.08 = 120,723.72 : x
  2. Step 2: Convert to fraction form
    386,993.72/580,470.08 = 120,723.72/x
  3. Step 3: Cross multiply
    386,993.72x = 580,470.08 × 120,723.72
  4. Step 4: Simplify right side
    386,993.72x = 70,076,507,406.30
  5. Step 5: Solve for x
    x = 70,076,507,406.30/386,993.72
  6. Step 6: Final answer
    x = 181,079.18

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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.