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Finding the Fourth Proportional to 1,402.66, 2,100.78 and 672.75

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Solution

The fourth proportional to 1,402.66, 2,100.78 and 672.75 is: 1,007.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.66 : 2,100.78 = 672.75 : x
  2. Step 2: Convert to fraction form
    1,402.66/2,100.78 = 672.75/x
  3. Step 3: Cross multiply
    1,402.66x = 2,100.78 × 672.75
  4. Step 4: Simplify right side
    1,402.66x = 1,413,299.75
  5. Step 5: Solve for x
    x = 1,413,299.75/1,402.66
  6. Step 6: Final answer
    x = 1,007.59

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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.