Home / 5,278.47-7,918.87-1,991.58

Finding the Fourth Proportional to 5,278.47, 7,918.87 and 1,991.58

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Solution

The fourth proportional to 5,278.47, 7,918.87 and 1,991.58 is: 2,987.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.47 : 7,918.87 = 1,991.58 : x
  2. Step 2: Convert to fraction form
    5,278.47/7,918.87 = 1,991.58/x
  3. Step 3: Cross multiply
    5,278.47x = 7,918.87 × 1,991.58
  4. Step 4: Simplify right side
    5,278.47x = 15,771,063.11
  5. Step 5: Solve for x
    x = 15,771,063.11/5,278.47
  6. Step 6: Final answer
    x = 2,987.81

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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.