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Finding the Fourth Proportional to 1,284.64, 1,772.67 and 725.14

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Solution

The fourth proportional to 1,284.64, 1,772.67 and 725.14 is: 1,000.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.64 : 1,772.67 = 725.14 : x
  2. Step 2: Convert to fraction form
    1,284.64/1,772.67 = 725.14/x
  3. Step 3: Cross multiply
    1,284.64x = 1,772.67 × 725.14
  4. Step 4: Simplify right side
    1,284.64x = 1,285,433.92
  5. Step 5: Solve for x
    x = 1,285,433.92/1,284.64
  6. Step 6: Final answer
    x = 1,000.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.