Home / 1,278.52-1,917.80-456.80

Finding the Fourth Proportional to 1,278.52, 1,917.80 and 456.80

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Solution

The fourth proportional to 1,278.52, 1,917.80 and 456.80 is: 685.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.52 : 1,917.80 = 456.80 : x
  2. Step 2: Convert to fraction form
    1,278.52/1,917.80 = 456.80/x
  3. Step 3: Cross multiply
    1,278.52x = 1,917.80 × 456.80
  4. Step 4: Simplify right side
    1,278.52x = 876,051.04
  5. Step 5: Solve for x
    x = 876,051.04/1,278.52
  6. Step 6: Final answer
    x = 685.21

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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.