Home / 5,128.42-7,077.13-2,890.51

Finding the Fourth Proportional to 5,128.42, 7,077.13 and 2,890.51

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Solution

The fourth proportional to 5,128.42, 7,077.13 and 2,890.51 is: 3,988.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.42 : 7,077.13 = 2,890.51 : x
  2. Step 2: Convert to fraction form
    5,128.42/7,077.13 = 2,890.51/x
  3. Step 3: Cross multiply
    5,128.42x = 7,077.13 × 2,890.51
  4. Step 4: Simplify right side
    5,128.42x = 20,456,515.04
  5. Step 5: Solve for x
    x = 20,456,515.04/5,128.42
  6. Step 6: Final answer
    x = 3,988.85

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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.