Home / 18,986-28,475.76-5,131.76

Finding the Fourth Proportional to 18,986, 28,475.76 and 5,131.76

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Solution

The fourth proportional to 18,986, 28,475.76 and 5,131.76 is: 7,696.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986 : 28,475.76 = 5,131.76 : x
  2. Step 2: Convert to fraction form
    18,986/28,475.76 = 5,131.76/x
  3. Step 3: Cross multiply
    18,986x = 28,475.76 × 5,131.76
  4. Step 4: Simplify right side
    18,986x = 146,130,766.14
  5. Step 5: Solve for x
    x = 146,130,766.14/18,986
  6. Step 6: Final answer
    x = 7,696.76

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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.