Home / 7,115.35-9,818.47-3,928.44

Finding the Fourth Proportional to 7,115.35, 9,818.47 and 3,928.44

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Solution

The fourth proportional to 7,115.35, 9,818.47 and 3,928.44 is: 5,420.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.35 : 9,818.47 = 3,928.44 : x
  2. Step 2: Convert to fraction form
    7,115.35/9,818.47 = 3,928.44/x
  3. Step 3: Cross multiply
    7,115.35x = 9,818.47 × 3,928.44
  4. Step 4: Simplify right side
    7,115.35x = 38,571,221.19
  5. Step 5: Solve for x
    x = 38,571,221.19/7,115.35
  6. Step 6: Final answer
    x = 5,420.85

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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.