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Finding the Fourth Proportional to 1,072.16, 1,479.57 and 679.51

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Solution

The fourth proportional to 1,072.16, 1,479.57 and 679.51 is: 937.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.16 : 1,479.57 = 679.51 : x
  2. Step 2: Convert to fraction form
    1,072.16/1,479.57 = 679.51/x
  3. Step 3: Cross multiply
    1,072.16x = 1,479.57 × 679.51
  4. Step 4: Simplify right side
    1,072.16x = 1,005,375.21
  5. Step 5: Solve for x
    x = 1,005,375.21/1,072.16
  6. Step 6: Final answer
    x = 937.71

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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.