Home / 5,128.65-7,077.39-2,890.49

Finding the Fourth Proportional to 5,128.65, 7,077.39 and 2,890.49

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Solution

The fourth proportional to 5,128.65, 7,077.39 and 2,890.49 is: 3,988.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.65 : 7,077.39 = 2,890.49 : x
  2. Step 2: Convert to fraction form
    5,128.65/7,077.39 = 2,890.49/x
  3. Step 3: Cross multiply
    5,128.65x = 7,077.39 × 2,890.49
  4. Step 4: Simplify right side
    5,128.65x = 20,457,089.63
  5. Step 5: Solve for x
    x = 20,457,089.63/5,128.65
  6. Step 6: Final answer
    x = 3,988.79

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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.