Home / 7,128.12-10,691.35-2,742.51

Finding the Fourth Proportional to 7,128.12, 10,691.35 and 2,742.51

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Solution

The fourth proportional to 7,128.12, 10,691.35 and 2,742.51 is: 4,113.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.12 : 10,691.35 = 2,742.51 : x
  2. Step 2: Convert to fraction form
    7,128.12/10,691.35 = 2,742.51/x
  3. Step 3: Cross multiply
    7,128.12x = 10,691.35 × 2,742.51
  4. Step 4: Simplify right side
    7,128.12x = 29,321,127.43
  5. Step 5: Solve for x
    x = 29,321,127.43/7,128.12
  6. Step 6: Final answer
    x = 4,113.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.