Home / 21,021.54-28,995.93-12,638.04

Finding the Fourth Proportional to 21,021.54, 28,995.93 and 12,638.04

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Solution

The fourth proportional to 21,021.54, 28,995.93 and 12,638.04 is: 17,432.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.54 : 28,995.93 = 12,638.04 : x
  2. Step 2: Convert to fraction form
    21,021.54/28,995.93 = 12,638.04/x
  3. Step 3: Cross multiply
    21,021.54x = 28,995.93 × 12,638.04
  4. Step 4: Simplify right side
    21,021.54x = 366,451,723.18
  5. Step 5: Solve for x
    x = 366,451,723.18/21,021.54
  6. Step 6: Final answer
    x = 17,432.20

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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.