Home / 1,386.36-2,077.78-519.80

Finding the Fourth Proportional to 1,386.36, 2,077.78 and 519.80

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Solution

The fourth proportional to 1,386.36, 2,077.78 and 519.80 is: 779.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.36 : 2,077.78 = 519.80 : x
  2. Step 2: Convert to fraction form
    1,386.36/2,077.78 = 519.80/x
  3. Step 3: Cross multiply
    1,386.36x = 2,077.78 × 519.80
  4. Step 4: Simplify right side
    1,386.36x = 1,080,030.04
  5. Step 5: Solve for x
    x = 1,080,030.04/1,386.36
  6. Step 6: Final answer
    x = 779.04

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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.