Home / 5,178.12-7,145.78-2,820.22

Finding the Fourth Proportional to 5,178.12, 7,145.78 and 2,820.22

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Solution

The fourth proportional to 5,178.12, 7,145.78 and 2,820.22 is: 3,891.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.12 : 7,145.78 = 2,820.22 : x
  2. Step 2: Convert to fraction form
    5,178.12/7,145.78 = 2,820.22/x
  3. Step 3: Cross multiply
    5,178.12x = 7,145.78 × 2,820.22
  4. Step 4: Simplify right side
    5,178.12x = 20,152,671.67
  5. Step 5: Solve for x
    x = 20,152,671.67/5,178.12
  6. Step 6: Final answer
    x = 3,891.89

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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.