Home / 5,178.78-7,146.49-2,820.91

Finding the Fourth Proportional to 5,178.78, 7,146.49 and 2,820.91

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Solution

The fourth proportional to 5,178.78, 7,146.49 and 2,820.91 is: 3,892.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.78 : 7,146.49 = 2,820.91 : x
  2. Step 2: Convert to fraction form
    5,178.78/7,146.49 = 2,820.91/x
  3. Step 3: Cross multiply
    5,178.78x = 7,146.49 × 2,820.91
  4. Step 4: Simplify right side
    5,178.78x = 20,159,605.11
  5. Step 5: Solve for x
    x = 20,159,605.11/5,178.78
  6. Step 6: Final answer
    x = 3,892.73

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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.