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Finding the Fourth Proportional to 1,420.58, 1,960.40 and 791.16

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Solution

The fourth proportional to 1,420.58, 1,960.40 and 791.16 is: 1,091.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.58 : 1,960.40 = 791.16 : x
  2. Step 2: Convert to fraction form
    1,420.58/1,960.40 = 791.16/x
  3. Step 3: Cross multiply
    1,420.58x = 1,960.40 × 791.16
  4. Step 4: Simplify right side
    1,420.58x = 1,550,986.11
  5. Step 5: Solve for x
    x = 1,550,986.11/1,420.58
  6. Step 6: Final answer
    x = 1,091.80

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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.