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Finding the Fourth Proportional to 21,003.68, 31,511.92 and 9,918.88

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Solution

The fourth proportional to 21,003.68, 31,511.92 and 9,918.88 is: 14,881.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.68 : 31,511.92 = 9,918.88 : x
  2. Step 2: Convert to fraction form
    21,003.68/31,511.92 = 9,918.88/x
  3. Step 3: Cross multiply
    21,003.68x = 31,511.92 × 9,918.88
  4. Step 4: Simplify right side
    21,003.68x = 312,562,953.05
  5. Step 5: Solve for x
    x = 312,562,953.05/21,003.68
  6. Step 6: Final answer
    x = 14,881.34

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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.