Home / 1,246.12-1,719.78-780.28

Finding the Fourth Proportional to 1,246.12, 1,719.78 and 780.28

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Solution

The fourth proportional to 1,246.12, 1,719.78 and 780.28 is: 1,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.12 : 1,719.78 = 780.28 : x
  2. Step 2: Convert to fraction form
    1,246.12/1,719.78 = 780.28/x
  3. Step 3: Cross multiply
    1,246.12x = 1,719.78 × 780.28
  4. Step 4: Simplify right side
    1,246.12x = 1,341,909.94
  5. Step 5: Solve for x
    x = 1,341,909.94/1,246.12
  6. Step 6: Final answer
    x = 1,076.87

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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.