Home / 1,311.14-1,966.10-386.46

Finding the Fourth Proportional to 1,311.14, 1,966.10 and 386.46

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Solution

The fourth proportional to 1,311.14, 1,966.10 and 386.46 is: 579.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.14 : 1,966.10 = 386.46 : x
  2. Step 2: Convert to fraction form
    1,311.14/1,966.10 = 386.46/x
  3. Step 3: Cross multiply
    1,311.14x = 1,966.10 × 386.46
  4. Step 4: Simplify right side
    1,311.14x = 759,817.07
  5. Step 5: Solve for x
    x = 759,817.07/1,311.14
  6. Step 6: Final answer
    x = 579.51

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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.