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Finding the Fourth Proportional to 1,071.92, 1,478.63 and 629.73

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Solution

The fourth proportional to 1,071.92, 1,478.63 and 629.73 is: 868.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.92 : 1,478.63 = 629.73 : x
  2. Step 2: Convert to fraction form
    1,071.92/1,478.63 = 629.73/x
  3. Step 3: Cross multiply
    1,071.92x = 1,478.63 × 629.73
  4. Step 4: Simplify right side
    1,071.92x = 931,137.67
  5. Step 5: Solve for x
    x = 931,137.67/1,071.92
  6. Step 6: Final answer
    x = 868.66

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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.