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Finding the Fourth Proportional to 21,705.54, 32,561.93 and 6,918.99

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Solution

The fourth proportional to 21,705.54, 32,561.93 and 6,918.99 is: 10,379.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,705.54 : 32,561.93 = 6,918.99 : x
  2. Step 2: Convert to fraction form
    21,705.54/32,561.93 = 6,918.99/x
  3. Step 3: Cross multiply
    21,705.54x = 32,561.93 × 6,918.99
  4. Step 4: Simplify right side
    21,705.54x = 225,295,563.24
  5. Step 5: Solve for x
    x = 225,295,563.24/21,705.54
  6. Step 6: Final answer
    x = 10,379.64

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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.