Home / 1,311.03-1,966.53-386.60

Finding the Fourth Proportional to 1,311.03, 1,966.53 and 386.60

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Solution

The fourth proportional to 1,311.03, 1,966.53 and 386.60 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.03 : 1,966.53 = 386.60 : x
  2. Step 2: Convert to fraction form
    1,311.03/1,966.53 = 386.60/x
  3. Step 3: Cross multiply
    1,311.03x = 1,966.53 × 386.60
  4. Step 4: Simplify right side
    1,311.03x = 760,250.67
  5. Step 5: Solve for x
    x = 760,250.67/1,311.03
  6. Step 6: Final answer
    x = 579.89

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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.