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Finding the Fourth Proportional to 1,072.34, 1,478.12 and 791.70

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Solution

The fourth proportional to 1,072.34, 1,478.12 and 791.70 is: 1,091.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.34 : 1,478.12 = 791.70 : x
  2. Step 2: Convert to fraction form
    1,072.34/1,478.12 = 791.70/x
  3. Step 3: Cross multiply
    1,072.34x = 1,478.12 × 791.70
  4. Step 4: Simplify right side
    1,072.34x = 1,170,227.60
  5. Step 5: Solve for x
    x = 1,170,227.60/1,072.34
  6. Step 6: Final answer
    x = 1,091.28

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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.