Home / 1,278.86-1,918.26-509.36

Finding the Fourth Proportional to 1,278.86, 1,918.26 and 509.36

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Solution

The fourth proportional to 1,278.86, 1,918.26 and 509.36 is: 764.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.86 : 1,918.26 = 509.36 : x
  2. Step 2: Convert to fraction form
    1,278.86/1,918.26 = 509.36/x
  3. Step 3: Cross multiply
    1,278.86x = 1,918.26 × 509.36
  4. Step 4: Simplify right side
    1,278.86x = 977,075.32
  5. Step 5: Solve for x
    x = 977,075.32/1,278.86
  6. Step 6: Final answer
    x = 764.02

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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.