Home / 1,246.80-1,719.88-780.24

Finding the Fourth Proportional to 1,246.80, 1,719.88 and 780.24

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Solution

The fourth proportional to 1,246.80, 1,719.88 and 780.24 is: 1,076.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.80 : 1,719.88 = 780.24 : x
  2. Step 2: Convert to fraction form
    1,246.80/1,719.88 = 780.24/x
  3. Step 3: Cross multiply
    1,246.80x = 1,719.88 × 780.24
  4. Step 4: Simplify right side
    1,246.80x = 1,341,919.17
  5. Step 5: Solve for x
    x = 1,341,919.17/1,246.80
  6. Step 6: Final answer
    x = 1,076.29

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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.