Home / 5,274.20-7,278.38-3,178.72

Finding the Fourth Proportional to 5,274.20, 7,278.38 and 3,178.72

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Solution

The fourth proportional to 5,274.20, 7,278.38 and 3,178.72 is: 4,386.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,274.20 : 7,278.38 = 3,178.72 : x
  2. Step 2: Convert to fraction form
    5,274.20/7,278.38 = 3,178.72/x
  3. Step 3: Cross multiply
    5,274.20x = 7,278.38 × 3,178.72
  4. Step 4: Simplify right side
    5,274.20x = 23,135,932.07
  5. Step 5: Solve for x
    x = 23,135,932.07/5,274.20
  6. Step 6: Final answer
    x = 4,386.62

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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.