Home / 1,318.46-1,819.48-720.97

Finding the Fourth Proportional to 1,318.46, 1,819.48 and 720.97

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Solution

The fourth proportional to 1,318.46, 1,819.48 and 720.97 is: 994.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.46 : 1,819.48 = 720.97 : x
  2. Step 2: Convert to fraction form
    1,318.46/1,819.48 = 720.97/x
  3. Step 3: Cross multiply
    1,318.46x = 1,819.48 × 720.97
  4. Step 4: Simplify right side
    1,318.46x = 1,311,781.40
  5. Step 5: Solve for x
    x = 1,311,781.40/1,318.46
  6. Step 6: Final answer
    x = 994.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.