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Finding the Fourth Proportional to 21,998.92, 30,345.07 and 13,040.43

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Solution

The fourth proportional to 21,998.92, 30,345.07 and 13,040.43 is: 17,987.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,998.92 : 30,345.07 = 13,040.43 : x
  2. Step 2: Convert to fraction form
    21,998.92/30,345.07 = 13,040.43/x
  3. Step 3: Cross multiply
    21,998.92x = 30,345.07 × 13,040.43
  4. Step 4: Simplify right side
    21,998.92x = 395,712,576.85
  5. Step 5: Solve for x
    x = 395,712,576.85/21,998.92
  6. Step 6: Final answer
    x = 17,987.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.