Home / 1,278.37-1,917.65-547.21

Finding the Fourth Proportional to 1,278.37, 1,917.65 and 547.21

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Solution

The fourth proportional to 1,278.37, 1,917.65 and 547.21 is: 820.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.37 : 1,917.65 = 547.21 : x
  2. Step 2: Convert to fraction form
    1,278.37/1,917.65 = 547.21/x
  3. Step 3: Cross multiply
    1,278.37x = 1,917.65 × 547.21
  4. Step 4: Simplify right side
    1,278.37x = 1,049,357.26
  5. Step 5: Solve for x
    x = 1,049,357.26/1,278.37
  6. Step 6: Final answer
    x = 820.86

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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.