Home / 21,009.78-31,481.81-17,876.90

Finding the Fourth Proportional to 21,009.78, 31,481.81 and 17,876.90

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Solution

The fourth proportional to 21,009.78, 31,481.81 and 17,876.90 is: 26,787.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.78 : 31,481.81 = 17,876.90 : x
  2. Step 2: Convert to fraction form
    21,009.78/31,481.81 = 17,876.90/x
  3. Step 3: Cross multiply
    21,009.78x = 31,481.81 × 17,876.90
  4. Step 4: Simplify right side
    21,009.78x = 562,797,169.19
  5. Step 5: Solve for x
    x = 562,797,169.19/21,009.78
  6. Step 6: Final answer
    x = 26,787.39

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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.