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Finding the Fourth Proportional to 1,208.77, 1,668.41 and 742.75

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Solution

The fourth proportional to 1,208.77, 1,668.41 and 742.75 is: 1,025.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.77 : 1,668.41 = 742.75 : x
  2. Step 2: Convert to fraction form
    1,208.77/1,668.41 = 742.75/x
  3. Step 3: Cross multiply
    1,208.77x = 1,668.41 × 742.75
  4. Step 4: Simplify right side
    1,208.77x = 1,239,207.81
  5. Step 5: Solve for x
    x = 1,239,207.81/1,208.77
  6. Step 6: Final answer
    x = 1,025.18

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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.