Home / 5,178.50-7,146.36-2,820.80

Finding the Fourth Proportional to 5,178.50, 7,146.36 and 2,820.80

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Solution

The fourth proportional to 5,178.50, 7,146.36 and 2,820.80 is: 3,892.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.50 : 7,146.36 = 2,820.80 : x
  2. Step 2: Convert to fraction form
    5,178.50/7,146.36 = 2,820.80/x
  3. Step 3: Cross multiply
    5,178.50x = 7,146.36 × 2,820.80
  4. Step 4: Simplify right side
    5,178.50x = 20,158,452.29
  5. Step 5: Solve for x
    x = 20,158,452.29/5,178.50
  6. Step 6: Final answer
    x = 3,892.72

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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.