Home / 1,278.48-1,917.69-412.77

Finding the Fourth Proportional to 1,278.48, 1,917.69 and 412.77

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Solution

The fourth proportional to 1,278.48, 1,917.69 and 412.77 is: 619.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.48 : 1,917.69 = 412.77 : x
  2. Step 2: Convert to fraction form
    1,278.48/1,917.69 = 412.77/x
  3. Step 3: Cross multiply
    1,278.48x = 1,917.69 × 412.77
  4. Step 4: Simplify right side
    1,278.48x = 791,564.90
  5. Step 5: Solve for x
    x = 791,564.90/1,278.48
  6. Step 6: Final answer
    x = 619.15

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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.