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Finding the Fourth Proportional to 1,315, 1,814.70 and 791.04

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Solution

The fourth proportional to 1,315, 1,814.70 and 791.04 is: 1,091.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315 : 1,814.70 = 791.04 : x
  2. Step 2: Convert to fraction form
    1,315/1,814.70 = 791.04/x
  3. Step 3: Cross multiply
    1,315x = 1,814.70 × 791.04
  4. Step 4: Simplify right side
    1,315x = 1,435,500.29
  5. Step 5: Solve for x
    x = 1,435,500.29/1,315
  6. Step 6: Final answer
    x = 1,091.64

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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.