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Finding the Fourth Proportional to 2,580.16, 3,869.92 and 936.64

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Solution

The fourth proportional to 2,580.16, 3,869.92 and 936.64 is: 1,404.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,580.16 : 3,869.92 = 936.64 : x
  2. Step 2: Convert to fraction form
    2,580.16/3,869.92 = 936.64/x
  3. Step 3: Cross multiply
    2,580.16x = 3,869.92 × 936.64
  4. Step 4: Simplify right side
    2,580.16x = 3,624,721.87
  5. Step 5: Solve for x
    x = 3,624,721.87/2,580.16
  6. Step 6: Final answer
    x = 1,404.84

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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.