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Finding the Fourth Proportional to 779.21, 1,168.45 and 291.92

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Solution

The fourth proportional to 779.21, 1,168.45 and 291.92 is: 437.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.21 : 1,168.45 = 291.92 : x
  2. Step 2: Convert to fraction form
    779.21/1,168.45 = 291.92/x
  3. Step 3: Cross multiply
    779.21x = 1,168.45 × 291.92
  4. Step 4: Simplify right side
    779.21x = 341,087.35
  5. Step 5: Solve for x
    x = 341,087.35/779.21
  6. Step 6: Final answer
    x = 437.74

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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.