Home / 5,178.65-7,146.54-2,820.78

Finding the Fourth Proportional to 5,178.65, 7,146.54 and 2,820.78

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Solution

The fourth proportional to 5,178.65, 7,146.54 and 2,820.78 is: 3,892.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.65 : 7,146.54 = 2,820.78 : x
  2. Step 2: Convert to fraction form
    5,178.65/7,146.54 = 2,820.78/x
  3. Step 3: Cross multiply
    5,178.65x = 7,146.54 × 2,820.78
  4. Step 4: Simplify right side
    5,178.65x = 20,158,817.10
  5. Step 5: Solve for x
    x = 20,158,817.10/5,178.65
  6. Step 6: Final answer
    x = 3,892.68

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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.