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Finding the Fourth Proportional to 305,761.80, 458,642.70 and 81,121.80

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Solution

The fourth proportional to 305,761.80, 458,642.70 and 81,121.80 is: 121,682.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,761.80 : 458,642.70 = 81,121.80 : x
  2. Step 2: Convert to fraction form
    305,761.80/458,642.70 = 81,121.80/x
  3. Step 3: Cross multiply
    305,761.80x = 458,642.70 × 81,121.80
  4. Step 4: Simplify right side
    305,761.80x = 37,205,921,380.86
  5. Step 5: Solve for x
    x = 37,205,921,380.86/305,761.80
  6. Step 6: Final answer
    x = 121,682.70

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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.