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Finding the Fourth Proportional to 783.09, 1,174.32 and 320.85

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Solution

The fourth proportional to 783.09, 1,174.32 and 320.85 is: 481.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.09 : 1,174.32 = 320.85 : x
  2. Step 2: Convert to fraction form
    783.09/1,174.32 = 320.85/x
  3. Step 3: Cross multiply
    783.09x = 1,174.32 × 320.85
  4. Step 4: Simplify right side
    783.09x = 376,780.57
  5. Step 5: Solve for x
    x = 376,780.57/783.09
  6. Step 6: Final answer
    x = 481.15

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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.