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Finding the Fourth Proportional to 1,072, 1,479.12 and 629.92

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Solution

The fourth proportional to 1,072, 1,479.12 and 629.92 is: 869.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072 : 1,479.12 = 629.92 : x
  2. Step 2: Convert to fraction form
    1,072/1,479.12 = 629.92/x
  3. Step 3: Cross multiply
    1,072x = 1,479.12 × 629.92
  4. Step 4: Simplify right side
    1,072x = 931,727.27
  5. Step 5: Solve for x
    x = 931,727.27/1,072
  6. Step 6: Final answer
    x = 869.15

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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.