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Finding the Fourth Proportional to 1,239.06, 1,710.10 and 791.13

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Solution

The fourth proportional to 1,239.06, 1,710.10 and 791.13 is: 1,091.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.06 : 1,710.10 = 791.13 : x
  2. Step 2: Convert to fraction form
    1,239.06/1,710.10 = 791.13/x
  3. Step 3: Cross multiply
    1,239.06x = 1,710.10 × 791.13
  4. Step 4: Simplify right side
    1,239.06x = 1,352,904.75
  5. Step 5: Solve for x
    x = 1,352,904.75/1,239.06
  6. Step 6: Final answer
    x = 1,091.88

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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.