Home / 1,318.76-1,976.56-615.02

Finding the Fourth Proportional to 1,318.76, 1,976.56 and 615.02

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Solution

The fourth proportional to 1,318.76, 1,976.56 and 615.02 is: 921.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.76 : 1,976.56 = 615.02 : x
  2. Step 2: Convert to fraction form
    1,318.76/1,976.56 = 615.02/x
  3. Step 3: Cross multiply
    1,318.76x = 1,976.56 × 615.02
  4. Step 4: Simplify right side
    1,318.76x = 1,215,619.92
  5. Step 5: Solve for x
    x = 1,215,619.92/1,318.76
  6. Step 6: Final answer
    x = 921.79

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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.