Home / 21,009.16-31,512.66-5,426.38

Finding the Fourth Proportional to 21,009.16, 31,512.66 and 5,426.38

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Solution

The fourth proportional to 21,009.16, 31,512.66 and 5,426.38 is: 8,139.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.16 : 31,512.66 = 5,426.38 : x
  2. Step 2: Convert to fraction form
    21,009.16/31,512.66 = 5,426.38/x
  3. Step 3: Cross multiply
    21,009.16x = 31,512.66 × 5,426.38
  4. Step 4: Simplify right side
    21,009.16x = 170,999,667.97
  5. Step 5: Solve for x
    x = 170,999,667.97/21,009.16
  6. Step 6: Final answer
    x = 8,139.29

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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.