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Finding the Fourth Proportional to 1,405.17, 2,107.08 and 664.16

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Solution

The fourth proportional to 1,405.17, 2,107.08 and 664.16 is: 995.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.17 : 2,107.08 = 664.16 : x
  2. Step 2: Convert to fraction form
    1,405.17/2,107.08 = 664.16/x
  3. Step 3: Cross multiply
    1,405.17x = 2,107.08 × 664.16
  4. Step 4: Simplify right side
    1,405.17x = 1,399,435.76
  5. Step 5: Solve for x
    x = 1,399,435.76/1,405.17
  6. Step 6: Final answer
    x = 995.92

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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.