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Finding the Fourth Proportional to 778.30, 1,167.90 and 291.69

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Solution

The fourth proportional to 778.30, 1,167.90 and 291.69 is: 437.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.30 : 1,167.90 = 291.69 : x
  2. Step 2: Convert to fraction form
    778.30/1,167.90 = 291.69/x
  3. Step 3: Cross multiply
    778.30x = 1,167.90 × 291.69
  4. Step 4: Simplify right side
    778.30x = 340,664.75
  5. Step 5: Solve for x
    x = 340,664.75/778.30
  6. Step 6: Final answer
    x = 437.70

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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.