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Finding the Fourth Proportional to 1,071.87, 1,479.06 and 629.61

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Solution

The fourth proportional to 1,071.87, 1,479.06 and 629.61 is: 868.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.87 : 1,479.06 = 629.61 : x
  2. Step 2: Convert to fraction form
    1,071.87/1,479.06 = 629.61/x
  3. Step 3: Cross multiply
    1,071.87x = 1,479.06 × 629.61
  4. Step 4: Simplify right side
    1,071.87x = 931,230.97
  5. Step 5: Solve for x
    x = 931,230.97/1,071.87
  6. Step 6: Final answer
    x = 868.79

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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.