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Finding the Fourth Proportional to 1,072.88, 1,480.79 and 679.63

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Solution

The fourth proportional to 1,072.88, 1,480.79 and 679.63 is: 938.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.88 : 1,480.79 = 679.63 : x
  2. Step 2: Convert to fraction form
    1,072.88/1,480.79 = 679.63/x
  3. Step 3: Cross multiply
    1,072.88x = 1,480.79 × 679.63
  4. Step 4: Simplify right side
    1,072.88x = 1,006,389.31
  5. Step 5: Solve for x
    x = 1,006,389.31/1,072.88
  6. Step 6: Final answer
    x = 938.03

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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.