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Finding the Fourth Proportional to 21,009.92, 31,511.64 and 9,321.08

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Solution

The fourth proportional to 21,009.92, 31,511.64 and 9,321.08 is: 13,980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.92 : 31,511.64 = 9,321.08 : x
  2. Step 2: Convert to fraction form
    21,009.92/31,511.64 = 9,321.08/x
  3. Step 3: Cross multiply
    21,009.92x = 31,511.64 × 9,321.08
  4. Step 4: Simplify right side
    21,009.92x = 293,722,517.37
  5. Step 5: Solve for x
    x = 293,722,517.37/21,009.92
  6. Step 6: Final answer
    x = 13,980.18

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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.