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Finding the Fourth Proportional to 778.28, 1,166.67 and 291.21

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Solution

The fourth proportional to 778.28, 1,166.67 and 291.21 is: 436.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.28 : 1,166.67 = 291.21 : x
  2. Step 2: Convert to fraction form
    778.28/1,166.67 = 291.21/x
  3. Step 3: Cross multiply
    778.28x = 1,166.67 × 291.21
  4. Step 4: Simplify right side
    778.28x = 339,748.16
  5. Step 5: Solve for x
    x = 339,748.16/778.28
  6. Step 6: Final answer
    x = 436.54

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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.