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Finding the Fourth Proportional to 794.51, 1,189.91 and 519.92

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Solution

The fourth proportional to 794.51, 1,189.91 and 519.92 is: 778.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.51 : 1,189.91 = 519.92 : x
  2. Step 2: Convert to fraction form
    794.51/1,189.91 = 519.92/x
  3. Step 3: Cross multiply
    794.51x = 1,189.91 × 519.92
  4. Step 4: Simplify right side
    794.51x = 618,649.46
  5. Step 5: Solve for x
    x = 618,649.46/794.51
  6. Step 6: Final answer
    x = 778.66

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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.