Home / 1,288.36-1,934.70-1,278.28

Finding the Fourth Proportional to 1,288.36, 1,934.70 and 1,278.28

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Solution

The fourth proportional to 1,288.36, 1,934.70 and 1,278.28 is: 1,919.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.36 : 1,934.70 = 1,278.28 : x
  2. Step 2: Convert to fraction form
    1,288.36/1,934.70 = 1,278.28/x
  3. Step 3: Cross multiply
    1,288.36x = 1,934.70 × 1,278.28
  4. Step 4: Simplify right side
    1,288.36x = 2,473,088.32
  5. Step 5: Solve for x
    x = 2,473,088.32/1,288.36
  6. Step 6: Final answer
    x = 1,919.56

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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.