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Finding the Fourth Proportional to 1,405.25, 2,107.88 and 672.60

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Solution

The fourth proportional to 1,405.25, 2,107.88 and 672.60 is: 1,008.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.25 : 2,107.88 = 672.60 : x
  2. Step 2: Convert to fraction form
    1,405.25/2,107.88 = 672.60/x
  3. Step 3: Cross multiply
    1,405.25x = 2,107.88 × 672.60
  4. Step 4: Simplify right side
    1,405.25x = 1,417,756.73
  5. Step 5: Solve for x
    x = 1,417,756.73/1,405.25
  6. Step 6: Final answer
    x = 1,008.90

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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.