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Finding the Fourth Proportional to 43,687.80, 65,531.70 and 20,359.80

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Solution

The fourth proportional to 43,687.80, 65,531.70 and 20,359.80 is: 30,539.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,687.80 : 65,531.70 = 20,359.80 : x
  2. Step 2: Convert to fraction form
    43,687.80/65,531.70 = 20,359.80/x
  3. Step 3: Cross multiply
    43,687.80x = 65,531.70 × 20,359.80
  4. Step 4: Simplify right side
    43,687.80x = 1,334,212,305.66
  5. Step 5: Solve for x
    x = 1,334,212,305.66/43,687.80
  6. Step 6: Final answer
    x = 30,539.70

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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.