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Finding the Fourth Proportional to 21,708.80, 32,562.60 and 6,918.80

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Solution

The fourth proportional to 21,708.80, 32,562.60 and 6,918.80 is: 10,378.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,708.80 : 32,562.60 = 6,918.80 : x
  2. Step 2: Convert to fraction form
    21,708.80/32,562.60 = 6,918.80/x
  3. Step 3: Cross multiply
    21,708.80x = 32,562.60 × 6,918.80
  4. Step 4: Simplify right side
    21,708.80x = 225,294,116.88
  5. Step 5: Solve for x
    x = 225,294,116.88/21,708.80
  6. Step 6: Final answer
    x = 10,378.01

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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.