Home / 7,115.20-9,818.94-3,928.70

Finding the Fourth Proportional to 7,115.20, 9,818.94 and 3,928.70

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Solution

The fourth proportional to 7,115.20, 9,818.94 and 3,928.70 is: 5,421.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.20 : 9,818.94 = 3,928.70 : x
  2. Step 2: Convert to fraction form
    7,115.20/9,818.94 = 3,928.70/x
  3. Step 3: Cross multiply
    7,115.20x = 9,818.94 × 3,928.70
  4. Step 4: Simplify right side
    7,115.20x = 38,575,645.34
  5. Step 5: Solve for x
    x = 38,575,645.34/7,115.20
  6. Step 6: Final answer
    x = 5,421.58

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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.