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Finding the Fourth Proportional to 1,420.93, 1,960.77 and 791.36

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Solution

The fourth proportional to 1,420.93, 1,960.77 and 791.36 is: 1,092.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.93 : 1,960.77 = 791.36 : x
  2. Step 2: Convert to fraction form
    1,420.93/1,960.77 = 791.36/x
  3. Step 3: Cross multiply
    1,420.93x = 1,960.77 × 791.36
  4. Step 4: Simplify right side
    1,420.93x = 1,551,674.95
  5. Step 5: Solve for x
    x = 1,551,674.95/1,420.93
  6. Step 6: Final answer
    x = 1,092.01

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1.5x scale

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.