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Finding the Fourth Proportional to 1,318.16, 1,819.94 and 919.71

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Solution

The fourth proportional to 1,318.16, 1,819.94 and 919.71 is: 1,269.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.16 : 1,819.94 = 919.71 : x
  2. Step 2: Convert to fraction form
    1,318.16/1,819.94 = 919.71/x
  3. Step 3: Cross multiply
    1,318.16x = 1,819.94 × 919.71
  4. Step 4: Simplify right side
    1,318.16x = 1,673,812.42
  5. Step 5: Solve for x
    x = 1,673,812.42/1,318.16
  6. Step 6: Final answer
    x = 1,269.81

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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.