Home / 1,311.48-1,966.91-386.79

Finding the Fourth Proportional to 1,311.48, 1,966.91 and 386.79

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Solution

The fourth proportional to 1,311.48, 1,966.91 and 386.79 is: 580.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.48 : 1,966.91 = 386.79 : x
  2. Step 2: Convert to fraction form
    1,311.48/1,966.91 = 386.79/x
  3. Step 3: Cross multiply
    1,311.48x = 1,966.91 × 386.79
  4. Step 4: Simplify right side
    1,311.48x = 760,771.81
  5. Step 5: Solve for x
    x = 760,771.81/1,311.48
  6. Step 6: Final answer
    x = 580.09

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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.