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Finding the Fourth Proportional to 2,160.39, 2,980.81 and 1,216

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Solution

The fourth proportional to 2,160.39, 2,980.81 and 1,216 is: 1,677.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.39 : 2,980.81 = 1,216 : x
  2. Step 2: Convert to fraction form
    2,160.39/2,980.81 = 1,216/x
  3. Step 3: Cross multiply
    2,160.39x = 2,980.81 × 1,216
  4. Step 4: Simplify right side
    2,160.39x = 3,624,664.96
  5. Step 5: Solve for x
    x = 3,624,664.96/2,160.39
  6. Step 6: Final answer
    x = 1,677.78

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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.