Home / 1,288.80-1,932.48-519.36

Finding the Fourth Proportional to 1,288.80, 1,932.48 and 519.36

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Solution

The fourth proportional to 1,288.80, 1,932.48 and 519.36 is: 778.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.80 : 1,932.48 = 519.36 : x
  2. Step 2: Convert to fraction form
    1,288.80/1,932.48 = 519.36/x
  3. Step 3: Cross multiply
    1,288.80x = 1,932.48 × 519.36
  4. Step 4: Simplify right side
    1,288.80x = 1,003,652.81
  5. Step 5: Solve for x
    x = 1,003,652.81/1,288.80
  6. Step 6: Final answer
    x = 778.75

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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.