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Finding the Fourth Proportional to 1,405.14, 2,103.03 and 854.61

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Solution

The fourth proportional to 1,405.14, 2,103.03 and 854.61 is: 1,279.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.14 : 2,103.03 = 854.61 : x
  2. Step 2: Convert to fraction form
    1,405.14/2,103.03 = 854.61/x
  3. Step 3: Cross multiply
    1,405.14x = 2,103.03 × 854.61
  4. Step 4: Simplify right side
    1,405.14x = 1,797,270.47
  5. Step 5: Solve for x
    x = 1,797,270.47/1,405.14
  6. Step 6: Final answer
    x = 1,279.07

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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.