Home / 1,278.32-1,765.80-1,129.17

Finding the Fourth Proportional to 1,278.32, 1,765.80 and 1,129.17

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Solution

The fourth proportional to 1,278.32, 1,765.80 and 1,129.17 is: 1,559.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.32 : 1,765.80 = 1,129.17 : x
  2. Step 2: Convert to fraction form
    1,278.32/1,765.80 = 1,129.17/x
  3. Step 3: Cross multiply
    1,278.32x = 1,765.80 × 1,129.17
  4. Step 4: Simplify right side
    1,278.32x = 1,993,888.39
  5. Step 5: Solve for x
    x = 1,993,888.39/1,278.32
  6. Step 6: Final answer
    x = 1,559.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.