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Finding the Fourth Proportional to 1,315.80, 1,974.78 and 796.32

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Solution

The fourth proportional to 1,315.80, 1,974.78 and 796.32 is: 1,195.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.80 : 1,974.78 = 796.32 : x
  2. Step 2: Convert to fraction form
    1,315.80/1,974.78 = 796.32/x
  3. Step 3: Cross multiply
    1,315.80x = 1,974.78 × 796.32
  4. Step 4: Simplify right side
    1,315.80x = 1,572,556.81
  5. Step 5: Solve for x
    x = 1,572,556.81/1,315.80
  6. Step 6: Final answer
    x = 1,195.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.