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Finding the Fourth Proportional to 685,079.55, 945,611.96 and 398,726.91

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Solution

The fourth proportional to 685,079.55, 945,611.96 and 398,726.91 is: 550,360.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,079.55 : 945,611.96 = 398,726.91 : x
  2. Step 2: Convert to fraction form
    685,079.55/945,611.96 = 398,726.91/x
  3. Step 3: Cross multiply
    685,079.55x = 945,611.96 × 398,726.91
  4. Step 4: Simplify right side
    685,079.55x = 377,040,932,876.21
  5. Step 5: Solve for x
    x = 377,040,932,876.21/685,079.55
  6. Step 6: Final answer
    x = 550,360.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.