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Finding the Fourth Proportional to 779.13, 1,168.86 and 316.91

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Solution

The fourth proportional to 779.13, 1,168.86 and 316.91 is: 475.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.13 : 1,168.86 = 316.91 : x
  2. Step 2: Convert to fraction form
    779.13/1,168.86 = 316.91/x
  3. Step 3: Cross multiply
    779.13x = 1,168.86 × 316.91
  4. Step 4: Simplify right side
    779.13x = 370,421.84
  5. Step 5: Solve for x
    x = 370,421.84/779.13
  6. Step 6: Final answer
    x = 475.43

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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.