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Finding the Fourth Proportional to 1,008.57, 1,512.68 and 277.97

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Solution

The fourth proportional to 1,008.57, 1,512.68 and 277.97 is: 416.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.57 : 1,512.68 = 277.97 : x
  2. Step 2: Convert to fraction form
    1,008.57/1,512.68 = 277.97/x
  3. Step 3: Cross multiply
    1,008.57x = 1,512.68 × 277.97
  4. Step 4: Simplify right side
    1,008.57x = 420,477.42
  5. Step 5: Solve for x
    x = 420,477.42/1,008.57
  6. Step 6: Final answer
    x = 416.90

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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.