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Finding the Fourth Proportional to 778.84, 1,167.50 and 291.80

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Solution

The fourth proportional to 778.84, 1,167.50 and 291.80 is: 437.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.84 : 1,167.50 = 291.80 : x
  2. Step 2: Convert to fraction form
    778.84/1,167.50 = 291.80/x
  3. Step 3: Cross multiply
    778.84x = 1,167.50 × 291.80
  4. Step 4: Simplify right side
    778.84x = 340,676.50
  5. Step 5: Solve for x
    x = 340,676.50/778.84
  6. Step 6: Final answer
    x = 437.42

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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.