Home / 1,311.59-1,966.80-386.82

Finding the Fourth Proportional to 1,311.59, 1,966.80 and 386.82

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Solution

The fourth proportional to 1,311.59, 1,966.80 and 386.82 is: 580.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.59 : 1,966.80 = 386.82 : x
  2. Step 2: Convert to fraction form
    1,311.59/1,966.80 = 386.82/x
  3. Step 3: Cross multiply
    1,311.59x = 1,966.80 × 386.82
  4. Step 4: Simplify right side
    1,311.59x = 760,804.95
  5. Step 5: Solve for x
    x = 760,804.95/1,311.59
  6. Step 6: Final answer
    x = 580.06

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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.