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Finding the Fourth Proportional to 1,124.10, 1,549.64 and 791.49

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Solution

The fourth proportional to 1,124.10, 1,549.64 and 791.49 is: 1,091.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.10 : 1,549.64 = 791.49 : x
  2. Step 2: Convert to fraction form
    1,124.10/1,549.64 = 791.49/x
  3. Step 3: Cross multiply
    1,124.10x = 1,549.64 × 791.49
  4. Step 4: Simplify right side
    1,124.10x = 1,226,524.56
  5. Step 5: Solve for x
    x = 1,226,524.56/1,124.10
  6. Step 6: Final answer
    x = 1,091.12

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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.