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Finding the Fourth Proportional to 331,079.80, 496,619.70 and 81,761.80

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Solution

The fourth proportional to 331,079.80, 496,619.70 and 81,761.80 is: 122,642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,079.80 : 496,619.70 = 81,761.80 : x
  2. Step 2: Convert to fraction form
    331,079.80/496,619.70 = 81,761.80/x
  3. Step 3: Cross multiply
    331,079.80x = 496,619.70 × 81,761.80
  4. Step 4: Simplify right side
    331,079.80x = 40,604,520,587.46
  5. Step 5: Solve for x
    x = 40,604,520,587.46/331,079.80
  6. Step 6: Final answer
    x = 122,642.70

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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.