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Finding the Fourth Proportional to 1,403.11, 2,103.45 and 672.14

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Solution

The fourth proportional to 1,403.11, 2,103.45 and 672.14 is: 1,007.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.11 : 2,103.45 = 672.14 : x
  2. Step 2: Convert to fraction form
    1,403.11/2,103.45 = 672.14/x
  3. Step 3: Cross multiply
    1,403.11x = 2,103.45 × 672.14
  4. Step 4: Simplify right side
    1,403.11x = 1,413,812.88
  5. Step 5: Solve for x
    x = 1,413,812.88/1,403.11
  6. Step 6: Final answer
    x = 1,007.63

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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.