Home / 1,278.78-1,928.81-1,126.61

Finding the Fourth Proportional to 1,278.78, 1,928.81 and 1,126.61

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Solution

The fourth proportional to 1,278.78, 1,928.81 and 1,126.61 is: 1,699.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.78 : 1,928.81 = 1,126.61 : x
  2. Step 2: Convert to fraction form
    1,278.78/1,928.81 = 1,126.61/x
  3. Step 3: Cross multiply
    1,278.78x = 1,928.81 × 1,126.61
  4. Step 4: Simplify right side
    1,278.78x = 2,173,016.63
  5. Step 5: Solve for x
    x = 2,173,016.63/1,278.78
  6. Step 6: Final answer
    x = 1,699.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.