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Finding the Fourth Proportional to 43,890.80, 65,879.40 and 21,729.20

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Solution

The fourth proportional to 43,890.80, 65,879.40 and 21,729.20 is: 32,615.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,890.80 : 65,879.40 = 21,729.20 : x
  2. Step 2: Convert to fraction form
    43,890.80/65,879.40 = 21,729.20/x
  3. Step 3: Cross multiply
    43,890.80x = 65,879.40 × 21,729.20
  4. Step 4: Simplify right side
    43,890.80x = 1,431,506,658.48
  5. Step 5: Solve for x
    x = 1,431,506,658.48/43,890.80
  6. Step 6: Final answer
    x = 32,615.19

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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.