Home / 1,377.20-2,065.80-511.28

Finding the Fourth Proportional to 1,377.20, 2,065.80 and 511.28

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Solution

The fourth proportional to 1,377.20, 2,065.80 and 511.28 is: 766.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.20 : 2,065.80 = 511.28 : x
  2. Step 2: Convert to fraction form
    1,377.20/2,065.80 = 511.28/x
  3. Step 3: Cross multiply
    1,377.20x = 2,065.80 × 511.28
  4. Step 4: Simplify right side
    1,377.20x = 1,056,202.22
  5. Step 5: Solve for x
    x = 1,056,202.22/1,377.20
  6. Step 6: Final answer
    x = 766.92

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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.