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Finding the Fourth Proportional to 778.42, 1,167.02 and 291.42

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Solution

The fourth proportional to 778.42, 1,167.02 and 291.42 is: 436.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.42 : 1,167.02 = 291.42 : x
  2. Step 2: Convert to fraction form
    778.42/1,167.02 = 291.42/x
  3. Step 3: Cross multiply
    778.42x = 1,167.02 × 291.42
  4. Step 4: Simplify right side
    778.42x = 340,085.68
  5. Step 5: Solve for x
    x = 340,085.68/778.42
  6. Step 6: Final answer
    x = 436.89

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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.