Home / 1,905.12-2,628.80-1,065.78

Finding the Fourth Proportional to 1,905.12, 2,628.80 and 1,065.78

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Solution

The fourth proportional to 1,905.12, 2,628.80 and 1,065.78 is: 1,470.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.12 : 2,628.80 = 1,065.78 : x
  2. Step 2: Convert to fraction form
    1,905.12/2,628.80 = 1,065.78/x
  3. Step 3: Cross multiply
    1,905.12x = 2,628.80 × 1,065.78
  4. Step 4: Simplify right side
    1,905.12x = 2,801,717.14
  5. Step 5: Solve for x
    x = 2,801,717.14/1,905.12
  6. Step 6: Final answer
    x = 1,470.63

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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.