Home / 7,115.15-9,818.74-3,928.33

Finding the Fourth Proportional to 7,115.15, 9,818.74 and 3,928.33

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Solution

The fourth proportional to 7,115.15, 9,818.74 and 3,928.33 is: 5,421.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.15 : 9,818.74 = 3,928.33 : x
  2. Step 2: Convert to fraction form
    7,115.15/9,818.74 = 3,928.33/x
  3. Step 3: Cross multiply
    7,115.15x = 9,818.74 × 3,928.33
  4. Step 4: Simplify right side
    7,115.15x = 38,571,250.90
  5. Step 5: Solve for x
    x = 38,571,250.90/7,115.15
  6. Step 6: Final answer
    x = 5,421.00

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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.