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Finding the Fourth Proportional to 1,008.72, 1,512.83 and 278.26

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Solution

The fourth proportional to 1,008.72, 1,512.83 and 278.26 is: 417.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.72 : 1,512.83 = 278.26 : x
  2. Step 2: Convert to fraction form
    1,008.72/1,512.83 = 278.26/x
  3. Step 3: Cross multiply
    1,008.72x = 1,512.83 × 278.26
  4. Step 4: Simplify right side
    1,008.72x = 420,960.08
  5. Step 5: Solve for x
    x = 420,960.08/1,008.72
  6. Step 6: Final answer
    x = 417.32

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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.