Home / 1,278.32-1,917.84-509.36

Finding the Fourth Proportional to 1,278.32, 1,917.84 and 509.36

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Solution

The fourth proportional to 1,278.32, 1,917.84 and 509.36 is: 764.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.32 : 1,917.84 = 509.36 : x
  2. Step 2: Convert to fraction form
    1,278.32/1,917.84 = 509.36/x
  3. Step 3: Cross multiply
    1,278.32x = 1,917.84 × 509.36
  4. Step 4: Simplify right side
    1,278.32x = 976,870.98
  5. Step 5: Solve for x
    x = 976,870.98/1,278.32
  6. Step 6: Final answer
    x = 764.18

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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.