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Finding the Fourth Proportional to 780.12, 1,169.82 and 369

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Solution

The fourth proportional to 780.12, 1,169.82 and 369 is: 553.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.12 : 1,169.82 = 369 : x
  2. Step 2: Convert to fraction form
    780.12/1,169.82 = 369/x
  3. Step 3: Cross multiply
    780.12x = 1,169.82 × 369
  4. Step 4: Simplify right side
    780.12x = 431,663.58
  5. Step 5: Solve for x
    x = 431,663.58/780.12
  6. Step 6: Final answer
    x = 553.33

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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.