Home / 1,278.79-1,918.73-499.34

Finding the Fourth Proportional to 1,278.79, 1,918.73 and 499.34

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Solution

The fourth proportional to 1,278.79, 1,918.73 and 499.34 is: 749.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.79 : 1,918.73 = 499.34 : x
  2. Step 2: Convert to fraction form
    1,278.79/1,918.73 = 499.34/x
  3. Step 3: Cross multiply
    1,278.79x = 1,918.73 × 499.34
  4. Step 4: Simplify right side
    1,278.79x = 958,104.68
  5. Step 5: Solve for x
    x = 958,104.68/1,278.79
  6. Step 6: Final answer
    x = 749.23

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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.