Home / 1,278.63-1,918.22-412.88

Finding the Fourth Proportional to 1,278.63, 1,918.22 and 412.88

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Solution

The fourth proportional to 1,278.63, 1,918.22 and 412.88 is: 619.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.63 : 1,918.22 = 412.88 : x
  2. Step 2: Convert to fraction form
    1,278.63/1,918.22 = 412.88/x
  3. Step 3: Cross multiply
    1,278.63x = 1,918.22 × 412.88
  4. Step 4: Simplify right side
    1,278.63x = 791,983.02
  5. Step 5: Solve for x
    x = 791,983.02/1,278.63
  6. Step 6: Final answer
    x = 619.40

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1.5x scale

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.