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Finding the Fourth Proportional to 778.35, 1,167.72 and 291.54

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Solution

The fourth proportional to 778.35, 1,167.72 and 291.54 is: 437.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.35 : 1,167.72 = 291.54 : x
  2. Step 2: Convert to fraction form
    778.35/1,167.72 = 291.54/x
  3. Step 3: Cross multiply
    778.35x = 1,167.72 × 291.54
  4. Step 4: Simplify right side
    778.35x = 340,437.09
  5. Step 5: Solve for x
    x = 340,437.09/778.35
  6. Step 6: Final answer
    x = 437.38

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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.