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Finding the Fourth Proportional to 1,009.72, 1,514.60 and 279.28

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Solution

The fourth proportional to 1,009.72, 1,514.60 and 279.28 is: 418.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.72 : 1,514.60 = 279.28 : x
  2. Step 2: Convert to fraction form
    1,009.72/1,514.60 = 279.28/x
  3. Step 3: Cross multiply
    1,009.72x = 1,514.60 × 279.28
  4. Step 4: Simplify right side
    1,009.72x = 422,997.49
  5. Step 5: Solve for x
    x = 422,997.49/1,009.72
  6. Step 6: Final answer
    x = 418.93

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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.