Home / 5,178-7,145.40-2,820.08

Finding the Fourth Proportional to 5,178, 7,145.40 and 2,820.08

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Solution

The fourth proportional to 5,178, 7,145.40 and 2,820.08 is: 3,891.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178 : 7,145.40 = 2,820.08 : x
  2. Step 2: Convert to fraction form
    5,178/7,145.40 = 2,820.08/x
  3. Step 3: Cross multiply
    5,178x = 7,145.40 × 2,820.08
  4. Step 4: Simplify right side
    5,178x = 20,150,599.63
  5. Step 5: Solve for x
    x = 20,150,599.63/5,178
  6. Step 6: Final answer
    x = 3,891.58

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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.