Home / 1,218.66-1,828.71-515.85

Finding the Fourth Proportional to 1,218.66, 1,828.71 and 515.85

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Solution

The fourth proportional to 1,218.66, 1,828.71 and 515.85 is: 774.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.66 : 1,828.71 = 515.85 : x
  2. Step 2: Convert to fraction form
    1,218.66/1,828.71 = 515.85/x
  3. Step 3: Cross multiply
    1,218.66x = 1,828.71 × 515.85
  4. Step 4: Simplify right side
    1,218.66x = 943,340.05
  5. Step 5: Solve for x
    x = 943,340.05/1,218.66
  6. Step 6: Final answer
    x = 774.08

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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.