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Finding the Fourth Proportional to 1,388.04, 2,082.46 and 618.36

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Solution

The fourth proportional to 1,388.04, 2,082.46 and 618.36 is: 927.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.04 : 2,082.46 = 618.36 : x
  2. Step 2: Convert to fraction form
    1,388.04/2,082.46 = 618.36/x
  3. Step 3: Cross multiply
    1,388.04x = 2,082.46 × 618.36
  4. Step 4: Simplify right side
    1,388.04x = 1,287,709.97
  5. Step 5: Solve for x
    x = 1,287,709.97/1,388.04
  6. Step 6: Final answer
    x = 927.72

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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.