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Finding the Fourth Proportional to 1,388.68, 1,913.04 and 1,167.64

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Solution

The fourth proportional to 1,388.68, 1,913.04 and 1,167.64 is: 1,608.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.68 : 1,913.04 = 1,167.64 : x
  2. Step 2: Convert to fraction form
    1,388.68/1,913.04 = 1,167.64/x
  3. Step 3: Cross multiply
    1,388.68x = 1,913.04 × 1,167.64
  4. Step 4: Simplify right side
    1,388.68x = 2,233,742.03
  5. Step 5: Solve for x
    x = 2,233,742.03/1,388.68
  6. Step 6: Final answer
    x = 1,608.54

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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.