Home / 21,180.45-31,775.70-6,389.49

Finding the Fourth Proportional to 21,180.45, 31,775.70 and 6,389.49

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Solution

The fourth proportional to 21,180.45, 31,775.70 and 6,389.49 is: 9,585.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,180.45 : 31,775.70 = 6,389.49 : x
  2. Step 2: Convert to fraction form
    21,180.45/31,775.70 = 6,389.49/x
  3. Step 3: Cross multiply
    21,180.45x = 31,775.70 × 6,389.49
  4. Step 4: Simplify right side
    21,180.45x = 203,030,517.39
  5. Step 5: Solve for x
    x = 203,030,517.39/21,180.45
  6. Step 6: Final answer
    x = 9,585.75

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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.