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Finding the Fourth Proportional to 1,405.76, 2,107.28 and 675.16

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Solution

The fourth proportional to 1,405.76, 2,107.28 and 675.16 is: 1,012.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.76 : 2,107.28 = 675.16 : x
  2. Step 2: Convert to fraction form
    1,405.76/2,107.28 = 675.16/x
  3. Step 3: Cross multiply
    1,405.76x = 2,107.28 × 675.16
  4. Step 4: Simplify right side
    1,405.76x = 1,422,751.16
  5. Step 5: Solve for x
    x = 1,422,751.16/1,405.76
  6. Step 6: Final answer
    x = 1,012.09

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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.