Home / 21,104.78-31,641.39-12,782.76

Finding the Fourth Proportional to 21,104.78, 31,641.39 and 12,782.76

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Solution

The fourth proportional to 21,104.78, 31,641.39 and 12,782.76 is: 19,164.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,104.78 : 31,641.39 = 12,782.76 : x
  2. Step 2: Convert to fraction form
    21,104.78/31,641.39 = 12,782.76/x
  3. Step 3: Cross multiply
    21,104.78x = 31,641.39 × 12,782.76
  4. Step 4: Simplify right side
    21,104.78x = 404,464,294.44
  5. Step 5: Solve for x
    x = 404,464,294.44/21,104.78
  6. Step 6: Final answer
    x = 19,164.59

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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.