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Finding the Fourth Proportional to 518,003.91, 777,111.34 and 218,485.61

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Solution

The fourth proportional to 518,003.91, 777,111.34 and 218,485.61 is: 327,772.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,003.91 : 777,111.34 = 218,485.61 : x
  2. Step 2: Convert to fraction form
    518,003.91/777,111.34 = 218,485.61/x
  3. Step 3: Cross multiply
    518,003.91x = 777,111.34 × 218,485.61
  4. Step 4: Simplify right side
    518,003.91x = 169,787,641,272.26
  5. Step 5: Solve for x
    x = 169,787,641,272.26/518,003.91
  6. Step 6: Final answer
    x = 327,772.90

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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.