Home / 21,185.78-31,778.85-5,390.83

Finding the Fourth Proportional to 21,185.78, 31,778.85 and 5,390.83

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Solution

The fourth proportional to 21,185.78, 31,778.85 and 5,390.83 is: 8,086.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,185.78 : 31,778.85 = 5,390.83 : x
  2. Step 2: Convert to fraction form
    21,185.78/31,778.85 = 5,390.83/x
  3. Step 3: Cross multiply
    21,185.78x = 31,778.85 × 5,390.83
  4. Step 4: Simplify right side
    21,185.78x = 171,314,377.95
  5. Step 5: Solve for x
    x = 171,314,377.95/21,185.78
  6. Step 6: Final answer
    x = 8,086.29

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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.