Home / 1,278.72-1,917.68-547.83

Finding the Fourth Proportional to 1,278.72, 1,917.68 and 547.83

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Solution

The fourth proportional to 1,278.72, 1,917.68 and 547.83 is: 821.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.72 : 1,917.68 = 547.83 : x
  2. Step 2: Convert to fraction form
    1,278.72/1,917.68 = 547.83/x
  3. Step 3: Cross multiply
    1,278.72x = 1,917.68 × 547.83
  4. Step 4: Simplify right side
    1,278.72x = 1,050,559.90
  5. Step 5: Solve for x
    x = 1,050,559.90/1,278.72
  6. Step 6: Final answer
    x = 821.57

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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.