Home / 20,515.78-30,780.83-6,477.98

Finding the Fourth Proportional to 20,515.78, 30,780.83 and 6,477.98

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Solution

The fourth proportional to 20,515.78, 30,780.83 and 6,477.98 is: 9,719.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.78 : 30,780.83 = 6,477.98 : x
  2. Step 2: Convert to fraction form
    20,515.78/30,780.83 = 6,477.98/x
  3. Step 3: Cross multiply
    20,515.78x = 30,780.83 × 6,477.98
  4. Step 4: Simplify right side
    20,515.78x = 199,397,601.12
  5. Step 5: Solve for x
    x = 199,397,601.12/20,515.78
  6. Step 6: Final answer
    x = 9,719.23

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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.