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Finding the Fourth Proportional to 28,739.80, 43,109.70 and 19,991.80

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Solution

The fourth proportional to 28,739.80, 43,109.70 and 19,991.80 is: 29,987.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,739.80 : 43,109.70 = 19,991.80 : x
  2. Step 2: Convert to fraction form
    28,739.80/43,109.70 = 19,991.80/x
  3. Step 3: Cross multiply
    28,739.80x = 43,109.70 × 19,991.80
  4. Step 4: Simplify right side
    28,739.80x = 861,840,500.46
  5. Step 5: Solve for x
    x = 861,840,500.46/28,739.80
  6. Step 6: Final answer
    x = 29,987.70

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1.5x scale

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.