Home / 7,176.56-9,903.78-3,990.11

Finding the Fourth Proportional to 7,176.56, 9,903.78 and 3,990.11

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Solution

The fourth proportional to 7,176.56, 9,903.78 and 3,990.11 is: 5,506.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,176.56 : 9,903.78 = 3,990.11 : x
  2. Step 2: Convert to fraction form
    7,176.56/9,903.78 = 3,990.11/x
  3. Step 3: Cross multiply
    7,176.56x = 9,903.78 × 3,990.11
  4. Step 4: Simplify right side
    7,176.56x = 39,517,196.38
  5. Step 5: Solve for x
    x = 39,517,196.38/7,176.56
  6. Step 6: Final answer
    x = 5,506.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.