Home / 1,311.75-1,966.28-618.80

Finding the Fourth Proportional to 1,311.75, 1,966.28 and 618.80

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Solution

The fourth proportional to 1,311.75, 1,966.28 and 618.80 is: 927.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.75 : 1,966.28 = 618.80 : x
  2. Step 2: Convert to fraction form
    1,311.75/1,966.28 = 618.80/x
  3. Step 3: Cross multiply
    1,311.75x = 1,966.28 × 618.80
  4. Step 4: Simplify right side
    1,311.75x = 1,216,721.14
  5. Step 5: Solve for x
    x = 1,216,721.14/1,311.75
  6. Step 6: Final answer
    x = 927.56

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1.5x scale

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.